USAir Flight 427
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USAir Flight 427 was a scheduled flight from Chicago's O'Hare International Airport to Palm Beach International Airport, Florida, with a stopover at Pittsburgh International Airport. On Thursday, September 8, 1994, the Boeing 737 flying this route crashed in Hopewell Township, Pennsylvania while approaching Runway 28R at Pittsburgh, which was USAir's largest hub at the time.
N513AU, the aircraft involved in the crash, at Orlando International Airport in 1991
Impact crater
Recovered wreckage under examination
Wake turbulence
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Wake turbulence is a disturbance in the atmosphere that forms behind an aircraft as it passes through the air. It includes several components, the most significant of which are wingtip vortices and jet-wash, the rapidly moving gases expelled from a jet engine.
This picture from a NASA study on wingtip vortices qualitatively illustrates the wake turbulence.
Wake vortices from a landing Airbus at Oakland International Airport interact with the sea as they descend to ground level.
XB-70 62-0207 following the midair collision on 8 June 1966.