Officials are still determining what caused an Army helicopter to collide with a plane. The DC crash near Reagan Airport killed 67 people.

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

The National Transportation Safety Board is holding a media briefing on the mid-air collision last month near Ronald Reagan ...