Staffing at the Reagan National Airport traffic control tower was "not normal" at the time of the D.C. mid-air plane crash, sources told ABC News.

Staffing at the Reagan National Airport traffic control tower was "not normal" at the time of the D.C. mid-air plane crash, sources told ABC News.

Staffing at the Reagan National Airport traffic control tower was "not normal" at the time of the D.C. mid-air plane crash, sources told ABC News.

This happens routinely, and on Wednesday night at Reagan National Airport, it happened 40 minutes earlier than it normally does because the supervisor determined that the traffic was low enough to ...

Staffing at the Reagan National Airport traffic control tower was "not normal" at the time of the D.C. mid-air plane crash, sources told ABC News.