If changes aren't made, that near-miss becomes a mid-air collision,” one aviation safety expert said. “Unfortunately, that's what we had last night.”

DCA Ronald Reagan Washington National Airport has shut down and The Federal Aviation Authority has confirmed a American Airlines Flight operated by PSA Airlines collided mid-air with a Blackhawk Sikor

An American Airlines regional jet went down in the Potomac River near Washington, D.C.'s Ronald Reagan Washington National Airport after colliding with a U.S. Army Black Hawk helicopter on Wednesday night, with no survivors expected.