The Army helicopter that collided with a plane over D.C. in January had incorrect altitude readings, contributing to the aircraft getting too close.

The National Transportation Safety Board has opened public hearings on a January midair collision between an Army Black Hawk helicopter and a commercial jet.

The U.S. Army helicopter involved in the midair collision over Ronald Reagan National Airport in January was flying higher than it was supposed to be when it crashed into an American Airlines flight that was about to land at the airport,