Preliminary flight data from the deadly plane crash near Reagan National Airport in Washington, D.C., shows conflicting ...

Readings have been compared from the black box recovered from American Eagle flight 5342 and the air traffic control tower ...

Air traffic controller 'left work early' before deadly crash as helicopter's flight height comes into question - A single ...

Data from air traffic control radar showed the military chopper was flying at 300 feet on the air traffic control display at ...

This data point is one of several key mysteries investigators are exploring as they seek to explain what caused the nation's ...

Victims' families gathered near the site where a plane and copter collided and fell into the Potomac River. 'They are all ...

A single controller was left to handle the air traffic of planes and helicopters flying over the airspace when two people would typically be monitoring both flight paths, sources told NBC.