Air crash investigations can take months, and federal investigators told reporters they would not speculate on the cause.

Investigators have announced that the black box from the Army Black Hawk helicopter that collided with a commercial jetliner ...

Officials are scrutinizing a range of factors in what National Transportation Safety Board Chairwoman Jennifer ... examining the actions of the military pilot as well as air traffic control ...

Investigators are examining the actions of the military pilot as well as air traffic control, after the helicopter apparently flew into the jet’s path. NTSB investigations normally take at least ...