Midair collisions throughout aviation history have brought some of the worst tragedies in the sky. But they've also left important lessons.

Details from the deadly crash between an American Airlines plane and an Army helicopter near Ronald Reagan Washington National Airport in D.C. harkens back to a similar plane crash in Cerritos, ...

What is a black box, what can it tell us, and have the data recorders been found from Flight 5342 and the Army's Blackhawk?

The helicopter’s GPS signal shows that it had taken off shortly before the crash. Aircraft collisions accounted for 12% of all aviation accidents last year ...