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

and commercial flights to more isolated regions, making them some of the most versatile aircraft in the skies. It's easy to ...

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, New York. All 45 passengers and the four crew members were killed when the ...

The fatal midair collision between an American Airlines passenger jet and an Army helicopter followed a string of near misses ...

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

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

Flights under eight hours require two pilots, no matter how many seats are on the plane. The market for pilots has become highly constrained. The military, once a regular source of commercial ...