Allegheny Airlines Flight 371 was a scheduled passenger flight on December 1, 1959, between Philadelphia, Pennsylvania and Cleveland, Ohio with stops in Pennsylvania at Harrisburg, Williamsport, Bradford, and Erie. The Martin 2-0-2 operating the flight departed Harrisburg with 26 passengers and crew on board and crashed while maneuvering to land at Williamsport Regional Airport in poor weather. A passenger was the sole survivor. Of the 26 passengers and crew many came from Pennsylvania or other Mid-Atlantic states, however there were two foreign nationals on board: one from France and the other from Lithuania. The crash was the first fatal accident in the history of Allegheny Airlines and was the deadliest until the 1969 crash of Allegheny Airlines Flight 853. Also the crash was the largest aviation incident in county history, and was the only deadly incident involving Williamsport Regional Airport until the Merion air disaster in 1991. Flight 371 was scheduled from Philadelphia to Cleveland with stops at Harrisburg, Williamsport, Bradford, and Erie. Flight 371 departed Philadelphia at 08:15 and proceeded under visual flight rules to Harrisburg where it landed at 08:51 without incident. Flight 371 departed Harrisburg at 09:06 with 22 revenue passengers, 4 crew members and 598 pounds of baggage, mail, and cargo. On Tuesday, 1 December 1959 at 09:06 EST (14:06 UTC) Allegheny Airlines Flight 371 departed Harrisburg-York State Airport with 22 revenue passengers, one additional crew member, and 598 pounds of cargo. The gross weight at time of takeoff was 36,429 pounds, which was 2,081 pounds below Maximum takeoff weight (MTOW). At 09:23 EST Flight 371 reported to Williamsport radio that it was making 360-degree turns five minutes south of the Williamsport low frequency range at an altitude of 3,500 feet, VFR, and requested an instrument clearance to the Williamsport Regional Airport. Williamsport responded by giving 371 airport weather conditions from 09:17 EST. At 09:27 EST 371 was cleared direct to airport from its present position and was to maintain 4,000 feet.