An American Airlines passenger jet and an Army helicopter collided on Jan. 29 as the plane prepared to land at Washington, D.

Helicopters in the area where the crash occurred are restricted to flying at an elevation of no more than 200 feet. Helicopter pilots typically fly and navigate using barometric altitude ...

The Jan. 29 collision between an Army helicopter and a passenger airplane over Washington killed 67 people. The Jan. 29 ...

Investigators previously said the helicopter may have had inaccurate altitude readings in the moments before the crash, and the crew may not have heard key instructions from air traffic controllers.