Black Hawk helicopter may not have heard order to go behind American Airlines jet - Washington DC plane crash: Black Hawk helicopter crew may not have heard traffic control instruction before American Airlines collision - American Airlines flight returns to gate over passenger hotspot name mentioning 'bomb' - Crew members killed in American Airlines crash receive posthumous honors - US to upgrade 'broken' air traffic system after American Airlines jet-army helicopter crash - American Airlines pilots made desperate last-ditch move to save doomed passenger plane - DC plane crash data show conflicting altitude readings from American Airlines jet and military helicopter - Crews to remove American Airlines plane from Potomac River soon - Who was flying the American Airlines plane and Black Hawk helicopter before Washington DC crash? - DC plane crash victims: List of who was on American Airlines flight 5342