Allegheny Airlines Flight 853 collided in mid-air with a Piper PA-28 Cherokee flown by a student pilot near Fairland, Indiana, killing all 83 occupants of and destroying both aircraft.

On September 9, 1969, Allegheny Airlines Flight 853, a McDonnell Douglas DC-9 operating a regularly scheduled flight from Boston, Massachusetts, to St. Louis, Missouri, with stops in Baltimore, Maryland; Cincinnati, Ohio; and Indianapolis, Indiana, collided mid-air with a Piper PA-28 light aircraft near Fairland, Indiana. The left wing of the PA-28 sheared off the DC-9's rear tail assembly, causing both to crash, killing all 83 occupants on board both aircraft. More than 50 years later, the incident remains Indiana's deadliest commercial airline disaster.