A military helicopter was carrying out a secretive training mission when it collided with an American Airlines passenger jet, the details of which are mostly “classified,” officials said. All three soldiers aboard the ill-fated UH-60 Black Hawk chopper were part of the 12th Aviation Battalion,

The Black Hawk helicopter that crashed into an American Airlines plane was alerted to the plane’s presence by air control twice, the first time at least two minutes before the deadly crash, according to a Washington Post report.

The Black Hawk helicopter that crashed into an American Airlines flight was alerted to the plane's presence by air control twice, according to the reports.