• The midair crash happened around 9 p.m. when a regional jet at the end of a flight from Wichita, Kansas, collided with a military helicopter on a training exercise, according to the Federal Aviation Administration.
  • A few minutes before the jet was to land, air traffic controllers asked American Airlines Flight 5342 if it could land on a shorter runway and the pilots agreed. Controllers cleared the jet to land and flight tracking sites showed the plane adjust its approach to the new runway.
  • Less than 30 seconds before the crash, an air traffic controller asked a helicopter if it had the arriving plane in sight. The controller made another radio call to the helicopter moments later: “PAT 25 pass behind the CRJ.” There was no reply. Seconds after that, the two aircraft collided.
  • The plane’s radio transponder stopped transmitting about 2,400 feet short of the runway, roughly over the middle of the Potomac.