A midair collision near Ronald Reagan Washington National Airport resulted in the deaths of all 67 people on board an American Airlines regional jet and a US Army Black Hawk helicopter. Investigations suggest potential air traffic control failures and pilot miscommunication, highlighting ongoing risks in one of the most controlled airspaces.A midair collision near Ronald Reagan Washington National Airport resulted in the deaths of all 67 people on board an American Airlines regional jet and a US Army Black Hawk helicopter. Investigations suggest potential air traffic control failures and pilot miscommunication, highlighting ongoing risks in one of the most controlled airspaces.