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href="https://geohack.toolforge.org/geohack.php?pagename=United_Air_Lines_Flight_521&params=40.7683_N_73.8847_W_type:event_globe:earth_region:US-NY"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">40°46′06″N</span> <span class="longitude">73°53′05″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">40.7683°N 73.8847°W</span><span style="display:none"> / <span class="geo">40.7683; -73.8847</span></span></span></a></span></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" 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color: white">Accident</th></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Date</th><td class="infobox-data" style="line-height:1.3em;">May 29, 1947</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Summary</th><td class="infobox-data" style="line-height:1.3em;"><a href="/wiki/Pilot_error" title="Pilot error">Pilot error</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Site</th><td class="infobox-data flabel location" style="line-height:1.3em;"><a href="/wiki/LaGuardia_Airport" title="LaGuardia Airport">LaGuardia Airport</a>,<br /><a href="/wiki/New_York_City" title="New York City">New York City</a>, United States<br /><span class="geo-inline"><style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=United_Air_Lines_Flight_521&params=40.7683_N_73.8847_W_type:event_globe:earth_region:US-NY"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">40°46′06″N</span> <span class="longitude">73°53′05″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">40.7683°N 73.8847°W</span><span style="display:none"> / <span class="geo">40.7683; -73.8847</span></span></span></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #082567; color: white">Aircraft</th></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Aircraft type</th><td class="infobox-data" style="line-height:1.3em;"><a href="/wiki/Douglas_DC-4" title="Douglas DC-4">Douglas DC-4</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Aircraft name</th><td class="infobox-data" style="line-height:1.3em;"><i>Mainliner Lake Tahoe</i></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Operator</th><td class="infobox-data" style="line-height:1.3em;"><a href="/wiki/United_Airlines" title="United Airlines">United Airlines</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;"><a href="/wiki/Aircraft_registration" title="Aircraft registration">Registration</a></th><td class="infobox-data" style="line-height:1.3em;">NC30046</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Flight origin</th><td class="infobox-data" style="line-height:1.3em;">LaGuardia Airport,<br />New York</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Destination</th><td class="infobox-data" style="line-height:1.3em;"><a href="/wiki/Cleveland_Hopkins_International_Airport" title="Cleveland Hopkins International Airport">Cleveland Municipal Airport</a>, <a href="/wiki/Cleveland" title="Cleveland">Cleveland</a>, <a href="/wiki/Ohio" title="Ohio">Ohio</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Occupants</th><td class="infobox-data" style="line-height:1.3em;">48</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Passengers</th><td class="infobox-data" style="line-height:1.3em;">44</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Crew</th><td class="infobox-data" style="line-height:1.3em;">4</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Fatalities</th><td class="infobox-data" style="line-height:1.3em;">43</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Injuries</th><td class="infobox-data" style="line-height:1.3em;">5</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.3em; padding-right:1.0em; white-space:nowrap;">Survivors</th><td class="infobox-data" style="line-height:1.3em;">5</td></tr></tbody></table> <p><b>United Air Lines Flight 521</b> was a scheduled <a href="/wiki/Passenger_flight" class="mw-redirect" title="Passenger flight">passenger flight</a> operated by a <a href="/wiki/Douglas_DC-4" title="Douglas DC-4">Douglas DC-4</a> from <a href="/wiki/LaGuardia_Airport" title="LaGuardia Airport">LaGuardia Airport</a> in New York City to <a href="/wiki/Cleveland,_Ohio" class="mw-redirect" title="Cleveland, Ohio">Cleveland, Ohio</a>. On May 29, 1947, while attempting to <a href="/wiki/Takeoff" title="Takeoff">take off</a> on <a href="/wiki/Runway" title="Runway">runway</a> 18, the aircraft failed to get airborne, <a href="/wiki/Runway_excursion" title="Runway excursion">overran</a> the end of the runway, ripped through an airport fence onto traffic on the <a href="/wiki/Grand_Central_Parkway" title="Grand Central Parkway">Grand Central Parkway</a>, and slammed into an embankment, ultimately plunging into a pond and exploding. Ten people escaped the flaming wreckage; only five of them survived.<sup id="cite_ref-dailynews_1-0" class="reference"><a href="#cite_note-dailynews-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>It was the <a href="/wiki/List_of_airplane_crashes" class="mw-redirect" title="List of airplane crashes">worst commercial aviation disaster</a> in United States history at the time. Its record stood for less than 24 hours before an <a href="/wiki/Eastern_Air_Lines_Flight_605" title="Eastern Air Lines Flight 605">Eastern Airlines DC-4 crashed</a> near Baltimore, Maryland, killing all 53 aboard.<sup id="cite_ref-dailynews_1-1" class="reference"><a href="#cite_note-dailynews-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Investigation">Investigation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=United_Air_Lines_Flight_521&action=edit&section=1" title="Edit section: Investigation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Civil_Aeronautics_Board" title="Civil Aeronautics Board">Civil Aeronautics Board</a> concluded the report on the accident by citing <a href="/wiki/Pilot_error" title="Pilot error">pilot error</a>. The report read: "The Board determines that the probable cause of this accident was either the failure of the pilot to release the <a href="/wiki/Gust_lock" title="Gust lock">gust lock</a> before take-off, or his decision to discontinue the take-off because of apprehension resulting from rapid use of a short runway under a possible calm wind condition." </p><p>Although the board came to the conclusion that pilot error was likely the cause, the May 31, 1947, edition of <i>The New York Times</i> told a different (albeit preliminary) tale: </p><p>"The United Air Lines DC-4 that crashed and burned at La Guardia Field Thursday night never got into the air and the <a href="/wiki/Pilot_(aviation)" class="mw-redirect" title="Pilot (aviation)">pilot</a>, after using up about two-thirds of the 3,500-foot runway, was trying to halt his giant craft by braking and ground looping. All night, on-the-scene inquiries by both the company and officials of the Civil Aeronautics Board established these facts yesterday. They agreed also that the wind shift, described by a company official as 'of almost unbelievable suddenness', led Capt. Benton R. Baldwin, the pilot, to decide against proceeding with the take-off, but they differed on whether the pilot had been apprised of approaching wind shifts before the take-off." </p><p>It seemed, at least early on, the cause may have actually been <a href="/wiki/Wind_shear" title="Wind shear">wind shear</a> (although it is referred to as "wind shift" in the article). </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=United_Air_Lines_Flight_521&action=edit&section=2" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-dailynews-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-dailynews_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-dailynews_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation news cs1"><a rel="nofollow" class="external text" href="http://www.nydailynews.com/archives/news/2000/09/21/2000-09-21_runway_18_air_safety__may-ju.html">"RUNWAY 18 Air Safety, May-June 1947 Chapter 197"</a>. <i>Daily News</i>. September 21, 2000<span class="reference-accessdate">. Retrieved <span class="nowrap">May 16,</span> 2009</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Daily+News&rft.atitle=RUNWAY+18+Air+Safety%2C+May-June+1947+Chapter+197&rft.date=2000-09-21&rft_id=http%3A%2F%2Fwww.nydailynews.com%2Farchives%2Fnews%2F2000%2F09%2F21%2F2000-09-21_runway_18_air_safety__may-ju.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnited+Air+Lines+Flight+521" class="Z3988"></span><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged March 2018">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=United_Air_Lines_Flight_521&action=edit&section=3" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://aviation-safety.net/database/record.php?id=19470529-1">Aviation Safety Network entry on the incident</a></li> <li><a rel="nofollow" class="external text" href="https://rosap.ntl.bts.gov/view/dot/33304">Report</a> of the <a href="/wiki/Civil_Aeronautics_Board" title="Civil Aeronautics Board">Civil Aeronautics Board</a> - <a rel="nofollow" class="external text" href="https://rosap.ntl.bts.gov/view/dot/33304/dot_33304_DS1.pdf">PDF</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist 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style="padding:0 0.25em"><div class="div-col" style="column-width: 25em;"> <div><div style="width:4em;display:inline-block;">Jan 11</div> <div style="display:inline-block;"><a href="/wiki/1947_BOAC_Douglas_C-47_crash" title="1947 BOAC Douglas C-47 crash">Stowting Dakota accident</a></div></div><div><div style="width:4em;display:inline-block;">Jan 25</div> <div style="display:inline-block;"><a href="/wiki/1947_Croydon_Dakota_accident" title="1947 Croydon Dakota accident">Croydon Dakota accident</a></div></div><div><div style="width:4em;display:inline-block;">Jan 26</div> <div style="display:inline-block;"><a href="/wiki/1947_KLM_Douglas_DC-3_Copenhagen_disaster" title="1947 KLM Douglas DC-3 Copenhagen disaster">KLM Copenhagen disaster</a></div></div><div><div style="width:4em;display:inline-block;">Feb 15</div> <div style="display:inline-block;"><a href="/wiki/1947_Avianca_Douglas_DC-4_crash" title="1947 Avianca Douglas DC-4 crash">Avianca Douglas DC-4 crash</a></div></div><div><div style="width:4em;display:inline-block;">May 29</div> <div style="display:inline-block;"><a class="mw-selflink selflink">United Air Lines Flight 521</a></div></div><div><div style="width:4em;display:inline-block;">May 29</div> <div style="display:inline-block;"><a href="/wiki/1947_H%C3%A9%C3%B0insfj%C3%B6r%C3%B0ur_air_crash" class="mw-redirect" title="1947 Héðinsfjörður air crash">Héðinsfjörður air crash</a></div></div><div><div style="width:4em;display:inline-block;">May 30</div> <div style="display:inline-block;"><a href="/wiki/Eastern_Air_Lines_Flight_605" title="Eastern Air Lines Flight 605">Eastern Air Lines Flight 605</a></div></div><div><div style="width:4em;display:inline-block;">Jun 13</div> <div style="display:inline-block;"><a href="/wiki/Pennsylvania_Central_Airlines_Flight_410" title="Pennsylvania Central Airlines Flight 410">Pennsylvania Central Airlines Flight 410</a></div></div><div><div style="width:4em;display:inline-block;">Jun 19</div> <div style="display:inline-block;"><a href="/wiki/Pan_Am_Flight_121" title="Pan Am Flight 121">Pan Am Flight 121</a></div></div><div><div style="width:4em;display:inline-block;">Jul 29</div> <div style="display:inline-block;"><a href="/wiki/1947_Yogyakarta_Dakota_accident" class="mw-redirect" title="1947 Yogyakarta Dakota accident">Yogyakarta Dakota accident</a></div></div><div><div style="width:4em;display:inline-block;">Aug 2</div> <div style="display:inline-block;"><a href="/wiki/1947_BSAA_Avro_Lancastrian_Star_Dust_accident" title="1947 BSAA Avro Lancastrian Star Dust accident">BSAA <i>Star Dust</i> accident</a></div></div><div><div style="width:4em;display:inline-block;">Aug 28</div> <div style="display:inline-block;"><a href="/wiki/Kvitbj%C3%B8rn_disaster" title="Kvitbjørn disaster"><i>Kvitbjørn</i> disaster</a></div></div><div><div style="width:4em;display:inline-block;">Oct 24</div> <div style="display:inline-block;"><a href="/wiki/United_Air_Lines_Flight_608" title="United Air Lines Flight 608">United Air Lines Flight 608</a></div></div><div><div style="width:4em;display:inline-block;">Oct 26</div> <div style="display:inline-block;"><a href="/wiki/Pan_Am_Flight_923" title="Pan Am Flight 923">Pan Am Flight 923</a></div></div><div><div style="width:4em;display:inline-block;">Nov 28</div> <div style="display:inline-block;"><a href="/wiki/General_Leclerc%27s_aviation_accident" title="General Leclerc's aviation accident">General Leclerc's aviation accident</a></div></div><div><div style="width:4em;display:inline-block;">Dec 27</div> <div style="display:inline-block;"><a href="/wiki/1947_Korangi_Creek_crash" title="1947 Korangi Creek crash">Korangi Creek crash</a></div></div> </div> <div class="div-col" style="column-width: 25em;"> </div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="/wiki/Template:Aviation_accidents_and_incidents_in_1946" title="Template:Aviation accidents and incidents in 1946">1946   ◄</a><span class="nowrap">   </span> <a href="/wiki/Template:Aviation_accidents_and_incidents_in_1948" title="Template:Aviation accidents and incidents in 1948">►   1948</a></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="United_Airlines_Holdings" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background:#0030A1; color:#FFFFFF"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:United_Airlines_Holdings" title="Template:United Airlines Holdings"><abbr title="View this template" style="color:#FFFFFF">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:United_Airlines_Holdings" title="Template talk:United Airlines Holdings"><abbr title="Discuss this template" style="color:#FFFFFF">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:United_Airlines_Holdings" title="Special:EditPage/Template:United Airlines Holdings"><abbr title="Edit this template" style="color:#FFFFFF">e</abbr></a></li></ul></div><div id="United_Airlines_Holdings" style="font-size:114%;margin:0 4em"><a href="/wiki/United_Airlines_Holdings" title="United Airlines Holdings"><span style="color:white;">United Airlines Holdings</span></a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Current airlines</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_Airlines" title="United Airlines">United Airlines</a> <ul><li><a href="/wiki/United_Airlines_fleet" title="United Airlines fleet">fleet</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Current marketing brands</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_Express" title="United Express">United Express</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Former airlines</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Capital_Airlines_(United_States)" title="Capital Airlines (United States)">Capital Airlines</a></li> <li><a href="/wiki/Continental_Airlines" title="Continental Airlines">Continental Airlines</a></li> <li><a href="/wiki/Continental_Micronesia" title="Continental Micronesia">Continental Micronesia</a></li> <li><a href="/wiki/Continental_West" class="mw-redirect" title="Continental West">Continental West</a></li> <li><a href="/wiki/New_York_Air" title="New York Air">New York Air</a></li> <li><a href="/wiki/Pan_Am" title="Pan Am">Pan Am</a></li> <li><a href="/wiki/People_Express_Airlines_(1980s)" title="People Express Airlines (1980s)">People Express Airlines</a></li> <li><a href="/wiki/Frontier_Airlines_(1950%E2%80%931986)" title="Frontier Airlines (1950–1986)">Frontier Airlines</a></li> <li><a href="/wiki/Texas_International_Airlines" title="Texas International Airlines">Texas International Airlines</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Former marketing brands</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Continental_Connection" title="Continental Connection">Continental Connection</a></li> <li><a href="/wiki/Continental_Express" title="Continental Express">Continental Express</a></li> <li><a href="/wiki/Continental_Lite" title="Continental Lite">Continental Lite</a></li> <li><a href="/wiki/Shuttle_by_United" title="Shuttle by United">Shuttle by United</a></li> <li><a href="/wiki/Ted_(airline)" title="Ted (airline)">Ted</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Former holding companies</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Frank_Lorenzo#Jet_Capital" title="Frank Lorenzo">Jet Capital Corporation</a></li> <li><a href="/wiki/Texas_Air_Corporation" title="Texas Air Corporation">Texas Air Corporation</a></li> <li><a href="/wiki/UAL_Corporation" title="UAL Corporation">UAL Corporation</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Frequent flyer services</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_Club" title="United Club">United Club</a></li> <li><a href="/wiki/MileagePlus" title="MileagePlus">MileagePlus</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/William_A._Patterson" title="William A. Patterson">William A. Patterson</a></li> <li><a href="/wiki/Glenn_Tilton" title="Glenn Tilton">Glenn Tilton</a></li> <li><a href="/wiki/Larry_Kellner" title="Larry Kellner">Larry Kellner</a></li> <li><a href="/wiki/Jeff_Smisek" title="Jeff Smisek">Jeff Smisek</a></li> <li><a href="/wiki/Oscar_Munoz_(executive)" title="Oscar Munoz (executive)">Oscar Munoz</a></li> <li><a href="/wiki/Walter_Varney" title="Walter Varney">Walter Varney</a></li> <li><a href="/wiki/Robert_Six" title="Robert Six">Robert Six</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Legal and public relations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Blakey_v._Continental_Airlines,_Inc." title="Blakey v. Continental Airlines, Inc.">Blakey v. Continental Airlines, Inc.</a></i></li> <li><a href="/wiki/Untied.com" title="Untied.com">Untied.com</a></li> <li>"<a href="/wiki/United_Breaks_Guitars" title="United Breaks Guitars">United Breaks Guitars</a>"</li> <li><a href="/wiki/2017_United_Express_passenger_removal" title="2017 United Express passenger removal">2017 United Express passenger removal</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">United Airlines<br />accidents and incidents</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_Air_Lines_Flight_23" title="United Air Lines Flight 23">Flight 23</a> (1933)</li> <li><a href="/wiki/1934_United_Air_Lines_Boeing_247_crash" title="1934 United Air Lines Boeing 247 crash">1934 Boeing 247 crash</a></li> <li><a href="/wiki/United_Air_Lines_Flight_4" title="United Air Lines Flight 4">Flight 4</a> (1935)</li> <li><a href="/wiki/United_Air_Lines_Flight_34" title="United Air Lines Flight 34">Flight 34</a> (1936)</li> <li><a href="/wiki/1943_Liberator_crash_at_Whenuapai" title="1943 Liberator crash at Whenuapai">1943 Liberator crash at Whenuapai</a> (1943)</li> <li><a class="mw-selflink selflink">Flight 521</a> (1947)</li> <li><a href="/wiki/United_Air_Lines_Flight_608" title="United Air Lines Flight 608">Flight 608</a> (1947)</li> <li><a href="/wiki/United_Air_Lines_Flight_624" title="United Air Lines Flight 624">Flight 624</a> (1948)</li> <li><a href="/wiki/United_Air_Lines_Flight_610" title="United Air Lines Flight 610">Flight 610</a> (1951)</li> <li><a href="/wiki/United_Air_Lines_Flight_615" title="United Air Lines Flight 615">Flight 615</a> (1951)</li> <li><a href="/wiki/1955_MacArthur_Airport_United_Airlines_crash" class="mw-redirect" title="1955 MacArthur Airport United Airlines crash">1955 MacArthur Airport United Airlines crash</a></li> <li><a href="/wiki/United_Air_Lines_Flight_409" title="United Air Lines Flight 409">Flight 409</a> (1955)</li> <li><a href="/wiki/United_Air_Lines_Flight_629" title="United Air Lines Flight 629">Flight 629</a> (1955)</li> <li><a href="/wiki/1956_Grand_Canyon_mid-air_collision" title="1956 Grand Canyon mid-air collision">1956 Grand Canyon mid-air collision</a></li> <li><a href="/wiki/United_Air_Lines_Flight_736" title="United Air Lines Flight 736">Flight 736</a> (1958)</li> <li><a href="/wiki/1960_New_York_mid-air_collision" title="1960 New York mid-air collision">1960 New York mid-air collision</a></li> <li><a href="/wiki/United_Air_Lines_Flight_859" title="United Air Lines Flight 859">Flight 859</a> (1961)</li> <li><a href="/wiki/United_Air_Lines_Flight_297" title="United Air Lines Flight 297">Flight 297</a> (1962)</li> <li><a href="/wiki/United_Air_Lines_Flight_823" title="United Air Lines Flight 823">Flight 823</a> (1964)</li> <li><a href="/wiki/United_Air_Lines_Flight_389" title="United Air Lines Flight 389">Flight 389</a> (1965)</li> <li><a href="/wiki/United_Air_Lines_Flight_227" title="United Air Lines Flight 227">Flight 227</a> (1965)</li> <li><a href="/wiki/United_Air_Lines_Flight_266" title="United Air Lines Flight 266">Flight 266</a> (1969)</li> <li><a href="/wiki/United_Air_Lines_Flight_553" title="United Air Lines Flight 553">Flight 553</a> (1972)</li> <li><a href="/wiki/United_Airlines_Flight_2860" title="United Airlines Flight 2860">Flight 2860</a> (1977)</li> <li><a href="/wiki/United_Airlines_Flight_173" title="United Airlines Flight 173">Flight 173</a> (1978)</li> <li><a href="/wiki/United_Airlines_Flight_2885" title="United Airlines Flight 2885">Flight 2885</a> (1983)</li> <li><a href="/wiki/United_Airlines_Flight_811" title="United Airlines Flight 811">Flight 811</a> (1989)</li> <li><a href="/wiki/United_Airlines_Flight_232" title="United Airlines Flight 232">Flight 232</a> (1989)</li> <li><a href="/wiki/United_Airlines_Flight_585" title="United Airlines Flight 585">Flight 585</a> (1991)</li> <li><a href="/wiki/United_Airlines_Flight_826" title="United Airlines Flight 826">Flight 826</a> (1997)</li> <li><a href="/wiki/United_Airlines_Flight_175" title="United Airlines Flight 175">Flight 175</a> (2001)</li> <li><a href="/wiki/United_Airlines_Flight_93" title="United Airlines Flight 93">Flight 93</a> (2001)</li> <li><a href="/wiki/United_Airlines_Flight_1175" title="United Airlines Flight 1175">Flight 1175</a> (2018)</li> <li><a href="/wiki/United_Airlines_Flight_328" title="United Airlines Flight 328">Flight 328</a> (2021)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">United Express<br />accidents and incidents</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_Express_Flight_2415" title="United Express Flight 2415">Flight 2415</a> (1989)</li> <li><a href="/wiki/United_Express_Flight_6291" title="United Express Flight 6291">Flight 6291</a> (1994)</li> <li><a href="/wiki/United_Express_Flight_5925" title="United Express Flight 5925">Flight 5925</a> (1996)</li> <li><a href="/wiki/2017_United_Express_passenger_removal" title="2017 United Express passenger removal">Flight 3411</a> (2017)</li> <li><a href="/wiki/CommutAir_Flight_4933" title="CommutAir Flight 4933">Flight 4933</a> (2019)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Continental Airlines<br />accidents and incidents</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Continental_Airlines_Flight_11" title="Continental Airlines Flight 11">Flight 11</a> (1962)</li> <li><a href="/wiki/Continental_Airlines_Flight_12" title="Continental Airlines Flight 12">Flight 12</a> (1965)</li> <li><a href="/wiki/Continental_Airlines_Flight_603" title="Continental Airlines Flight 603">Flight 603</a> (1978)</li> <li><a href="/wiki/Continental_Airlines_Flight_1713" title="Continental Airlines Flight 1713">Flight 1713</a> (1987)</li> <li><a href="/wiki/Air_France_Flight_4590" title="Air France Flight 4590">Flight 55</a> (2000)</li> <li><a href="/wiki/Continental_Airlines_Flight_1883" title="Continental Airlines Flight 1883">Flight 1883</a> (2006)</li> <li><a href="/wiki/Continental_Airlines_Flight_1404" title="Continental Airlines Flight 1404">Flight 1404</a> (2008)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Continental Express / Connection<br />accidents and incidents</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Trans-Colorado_Airlines_Flight_2286" title="Trans-Colorado Airlines Flight 2286">Flight 2286</a> (1988)</li> <li><a href="/wiki/Continental_Express_Flight_2574" title="Continental Express Flight 2574">Flight 2574</a> (1991)</li> <li><a href="/wiki/Colgan_Air_Flight_3407" title="Colgan Air Flight 3407">Flight 3407</a> (2009)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#0030A1; color:#FFFFFF;width:1%">Facilities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Willis_Tower" title="Willis Tower">Willis Tower</a> (Chicago)</li> <li><a href="/wiki/77_West_Wacker_Drive" title="77 West Wacker Drive">77 West Wacker Drive</a> (Chicago)</li> <li><a href="/wiki/1600_Smith_Street" title="1600 Smith Street">1600 Smith Street</a> (Houston)</li> <li><a href="/wiki/Cullen_Center#600_Jefferson" title="Cullen Center">600 Jefferson</a> (Houston)</li> <li><a href="/wiki/American_General_Center" title="American General Center">American General Center</a> <span style="font-size:85%;">(former)</span></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background:#0030A1; color:#FFFFFF"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:United_Airlines" title="Category:United Airlines"><span style="color:white;">Category</span></a></li> <li><a href="/wiki/List_of_airline_holding_companies" title="List of airline holding companies"><span style="color:white;">List of airline holding companies</span></a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Aviation_accidents_and_incidents_in_the_United_States_and_U.S._territories_in_the_1940s" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Aviation_accidents_and_incidents_in_the_United_States_in_the_1940s" title="Template:Aviation accidents and incidents in the United States in the 1940s"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Aviation_accidents_and_incidents_in_the_United_States_in_the_1940s" title="Template talk:Aviation accidents and incidents in the United States in the 1940s"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Aviation_accidents_and_incidents_in_the_United_States_in_the_1940s" title="Special:EditPage/Template:Aviation accidents and incidents in the United States in the 1940s"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Aviation_accidents_and_incidents_in_the_United_States_and_U.S._territories_in_the_1940s" style="font-size:114%;margin:0 4em">Aviation accidents and incidents in the United States and U.S. territories in the 1940s</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">1940</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Lovettsville_air_disaster" title="Lovettsville air disaster">Lovettsville air disaster</a> (August 1940)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1941</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Eastern_Air_Lines_Flight_21" title="Eastern Air Lines Flight 21">Eastern Air Lines Flight 21</a> (February 1941)</li> <li><a href="/wiki/Northwest_Airlines_Flight_5_(1941)" class="mw-redirect" title="Northwest Airlines Flight 5 (1941)">Northwest Airlines Flight 5</a> (October 1941)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1942</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/TWA_Flight_3" title="TWA Flight 3">TWA Flight 3</a> (January 1942)</li> <li><a href="/wiki/American_Airlines_Flight_28" title="American Airlines Flight 28">American Airlines Flight 28</a> (October 1942)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1943</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pan_Am_Flight_1104" title="Pan Am Flight 1104">Pan Am Flight 1104</a> (January 1943)</li> <li><a href="/wiki/American_Airlines_Flight_63_(Flagship_Ohio)" class="mw-redirect" title="American Airlines Flight 63 (Flagship Ohio)">American Airlines Flight 63 (Flagship Ohio)</a> (July 1943)</li> <li><a href="/wiki/American_Airlines_Flight_63_(Flagship_Missouri)" class="mw-redirect" title="American Airlines Flight 63 (Flagship Missouri)">American Airlines Flight 63 (Flagship Missouri)</a> (October 1943)</li> <li><a href="/wiki/1943_Tamaqua_plane_crash" class="mw-redirect" title="1943 Tamaqua plane crash">Tamaqua, PA crash</a> (November 1943)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1944</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/American_Airlines_Flight_2" title="American Airlines Flight 2">American Airlines Flight 2</a> (February 1944)</li> <li><a href="/wiki/TWA_Flight_277" title="TWA Flight 277">TWA Flight 277</a> (June 1944)</li> <li><a href="/wiki/South_Portland_A-26_Invader_crash" title="South Portland A-26 Invader crash">South Portland A-26 Invader crash</a> (July 1944)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1945</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/American_Airlines_Flight_6001" title="American Airlines Flight 6001">American Airlines Flight 6001</a> (January 1945)</li> <li><a href="/wiki/Eastern_Air_Lines_Flight_45" title="Eastern Air Lines Flight 45">Eastern Air Lines Flight 45</a> (July 1945)</li> <li><a href="/wiki/National_Airlines_Flight_16" title="National Airlines Flight 16">National Airlines Flight 16</a> (October 1945)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1946</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pennsylvania_Central_Airlines_Flight_105" title="Pennsylvania Central Airlines Flight 105">Pennsylvania Central Airlines Flight 105</a> (January 1946)</li> <li><a href="/wiki/Mount_Tom_B-17_crash" title="Mount Tom B-17 crash">Mount Tom B-17 crash</a> (July 9 1946)</li> <li><a href="/wiki/TWA_Flight_513" title="TWA Flight 513">TWA Flight 513</a> (July 11 1946)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1947</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">United Air Lines Flight 521</a> (May 29 1947)</li> <li><a href="/wiki/Eastern_Air_Lines_Flight_605" title="Eastern Air Lines Flight 605">Eastern Air Lines Flight 605</a> (May 30 1947)</li> <li><a href="/wiki/Pennsylvania_Central_Airlines_Flight_410" title="Pennsylvania Central Airlines Flight 410">Pennsylvania Central Airlines Flight 410</a> (June 1947)</li> <li><a href="/wiki/United_Air_Lines_Flight_608" title="United Air Lines Flight 608">United Air Lines Flight 608</a> (October 24 1947)</li> <li><a href="/wiki/Pan_Am_Flight_923" title="Pan Am Flight 923">Pan Am Flight 923</a> (October 26 1947)*</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1948</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Mantell_UFO_incident" title="Mantell UFO incident">Mantell UFO incident</a> (January 7 1948)</li> <li><a href="/wiki/1948_Los_Gatos_DC-3_crash" title="1948 Los Gatos DC-3 crash">Los Gatos DC-3 crash</a> (January 28 1948)</li> <li><a href="/wiki/Delta_Air_Lines_Flight_705" title="Delta Air Lines Flight 705">Delta Air Lines Flight 705</a> (March 10 1948)</li> <li><a href="/wiki/Northwest_Airlines_Flight_4422" title="Northwest Airlines Flight 4422">Northwest Airlines Flight 4422</a> (March 12 1948)</li> <li><a href="/wiki/United_Air_Lines_Flight_624" title="United Air Lines Flight 624">United Air Lines Flight 624</a> (June 1948)</li> <li><a href="/wiki/1948_Lake_Mead_Boeing_B-29_crash" title="1948 Lake Mead Boeing B-29 crash">Lake Mead Boeing B-29 crash</a> (July 1948)</li> <li><a href="/wiki/Northwest_Airlines_Flight_421" title="Northwest Airlines Flight 421">Northwest Airlines Flight 421</a> (August 1948)</li> <li><a href="/wiki/1948_Georgia_USAF_Boeing_B-29_crash" title="1948 Georgia USAF Boeing B-29 crash">Georgia USAF Boeing B-29 crash</a> (October 1948)</li> <li><a href="/wiki/1948_Airborne_Transport_DC-3_disappearance" title="1948 Airborne Transport DC-3 disappearance">Airborne Transport DC-3 disappearance</a> (December 1948)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1949</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/1949_Strato-Freight_Curtiss_C-46A_crash" title="1949 Strato-Freight Curtiss C-46A crash">Strato-Freight Curtiss C-46A crash</a> (June 1949)</li> <li><a href="/wiki/Standard_Air_Lines_Flight_897R" title="Standard Air Lines Flight 897R">Standard Air Lines Flight 897R</a> (July 1949)</li> <li><a href="/wiki/Eastern_Air_Lines_Flight_537" title="Eastern Air Lines Flight 537">Eastern Air Lines Flight 537</a> (November 1 1949)</li> <li><a href="/wiki/American_Airlines_Flight_157" title="American Airlines Flight 157">American Airlines Flight 157</a> (November 29 1949)</li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>This list is incomplete.<br />An asterisk (*) denotes an incident that took place in a U.S. territory, including <a href="/wiki/Territory_of_Alaska" title="Territory of Alaska">Alaska</a> and <a href="/wiki/Territory_of_Hawaii" title="Territory of Hawaii">Hawaii</a> prior to statehood..</div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=United_Air_Lines_Flight_521&oldid=1246435545">https://en.wikipedia.org/w/index.php?title=United_Air_Lines_Flight_521&oldid=1246435545</a>"</div></div> <div id="catlinks" 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