The U.S. Federal Aviation Administration (FAA) and the National Transportation Safety Board (NTSB) are investigating U.S. President Donald Trump’s military helicopter, Marine One, after it momentarily flew too close to a passenger jet departing from Ronald Reagan Washington National Airport (DCA). Air traffic controllers didn’t pause commercial departures at Reagan National, as required by a policy implemented after a crash last year. President Trump’s Marine One departed from the Ellipse near the White House at around 2:33 p.m. local time on Tuesday, Aug. 4. The passenger jet involved in this incident was Envoy Air flight 3742, a regional jet operated on behalf of American Airlines that was departing from DCA. It further added that President Trump wasn’t in danger, and that an air traffic controller stayed in contact with both pilots throughout the brief incident.