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|operator = Northwest Orient Airlines |tail_number = }} Northwest Orient Airlines Flight 2501 was a DC-4 propliner operating its daily transcontinental service between New York City and Seattle when it disappeared on the night of June 23, 1950. The flight was carrying 55 passengers and three crew members; the loss of all 58 on board made it the deadliest commercial airliner accident in American history at the time. The aircraft was at approximately over Lake Michigan, NNW of Benton Harbor, Michigan〔. Retrieved on 2008-01-27〕 when it vanished from radar screens after requesting a descent to . A widespread search was commenced including using sonar and dragging the bottom of Lake Michigan with trawlers, but to no avail. Considerable light debris, upholstery, and human body fragments were found floating on the surface, but divers were unable to locate the plane's wreckage.〔The disappearance was the deadliest aviation disaster since the Llandow air disaster earlier that year, which killed 80. == Cause == It is known that Flight 2501 was entering a squall line and turbulence, but since the plane's wreckage was not found, the cause of the crash was never determined.〔(【引用サイトリンク】publisher=Michigan Shipwreck Research Associates )〕 The incident was reported as follows: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Northwest Orient Airlines Flight 2501」の詳細全文を読む スポンサード リンク
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