Black Hawk helicopter may not have heard order to go behind American Airlines jet - DC plane crash: Black Hawk helicopter was on a 'continuity of government' drill - Mapped: How American Airlines plane collided with Black Hawk army helicopter near Washington DC airport - Third soldier inside Black Hawk helicopter involved in DC midair collision identified - Experts ask why Black Hawk chopper may have been flying above allowed altitude - Black Hawk chopper involved in D.C. collision was on training flight - What's it's like flying in a Black Hawk helicopter - Black Hawk chopper unit was on annual proficiency training flight, Hegseth says