Incorrect altitude readings on the Army helicopter that collided with a passenger plane over Washington, D.C., in January contributed to the aircraft getting too close, but air traffic controllers warned about the hazards helicopter traffic presented years before the crash.

Brother of DC plane crash victim Dailey Crafton joins 'Fox & Friends First' to discuss the loss of his brother Casey ahead of the National Transportation Safety Board hearings for the mid-air collision that killed 67.

The January midair collision near Ronald Reagan Washington National Airport, which killed 67 people, is the topic of a three-day investigative hearing by the National Transportation Safety Board.