The radio altimeter on board the Black Hawk at the time of the deadly midair collision read 278 feet, Homendy said. That altimeter uses a radio beam to show the helicopter’s altitude above ground ...

The crew of the helicopter that collided midair with an American Airlines jet near Washington D.C.’s Ronald Reagan National Airport might not have heard instructions from the air traffic ...

After comparing voice recordings from the control tower and the Black Hawk, investigators believe the helicopter pilots may not have heard some of the instructions from the tower. In particular ...