Air traffic controllers twice alerted the crew of a U.S. Army helicopter to the presence of an inbound American Airlines jet, with the first warning issued two minutes before the aircraft collided ...
A Washington, D.C.-area helicopter pilot says Army Black Hawk was flying published route and on appropriate radio frequency.
The audio indicates that air traffic controllers tried to warn the Army helicopter about a nearby Canadair Regional Jet.
More from the final moments of the doomed aircraft has emerged in a series of recordings from Air Traffic Control.