Airlines have issued travel waivers to help passengers whose flights into and out of Washington, D.C., were affected following a deadly midair collision on Wednesday.

Authorities are investigating how two aircraft crashed in mid-air despite normal flight patterns and communications.

The first officer on the American Airlines plane that crashed into a military helicopter Wednesday night—killing all 64 people on board—has been identified by his father as one of the victims alongside American and Russian figure skaters,

The Army official said that the pilots were on a routine training flight along a familiar flight path that isn't particularly complicated.