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.

The report, reviewed by The New York Times, said that one controller was communicating with both helicopters and planes.

Audio of air traffic control captured the moment that workers observed a Black Hawk helicopter colliding with a passenger jet ...

Air traffic control audio from a plane crash near Ronald Reagan National Airport sheds light on the moments before and after ...

Air traffic control audio recorded the moments before and after an American Airlines regional passenger jet crashedwith a U.S ...