Marine One's warning calls before mishap went unheard by Reagan air traffic controllers, NTSB says

Air traffic controllers in Washington and the pilots of President Trump's helicopter met to discuss communication issues one week before a jet was allowed to take off just as Marine One left the White House, federal investigators said Thursday. Controllers reported not receiving the standard three-minute warning call ahead of Marine One flights and both sides agreed to an alternative in those instances — but that plan to relay the radio call through someone else was also unsuccessful on the day of the Aug. 4 incident near Ronald Reagan Washington National Airport, the National Transportation Safety Board's preliminary report shows....