Collisions like the one between an American Airlines plane and a helicopter over the Potomac River in D.C. this week have led ...

As investigators try to uncover what happened when an airplane and a helicopter collided over the Potomac River, here is the latest information.

Fatal crashes of commercial aircraft in the U.S. have become a rarity. The deadliest recent crash was in 2009 near Buffalo, ...

However, they can be very noisy, limiting their use in commercial operations. A famous example of a contra-rotating propeller ...

Before Wednesday's crash between a passenger jet and an Army Black Hawk helicopter, the last fatal crash involving a U.S. commercial airline occurred in 2009 in New York.

Fatal crashes of commercial aircraft in the U.S. have become a rarity. The last was in 2009 near Buffalo, New York.