The Federal Aviation Administration (FAA) is investigating an air-safety incident involving Donald Trump’s Marine One helicopter above Washington, DC. According to multiple reports, Marine One lifts off from the White House with the president on board and approaches closer than permitted to another aircraft. The FAA investigation focuses on air-traffic handling around Ronald Reagan Washington National Airport, where certain post-crash safety procedures are required when an aircraft with presidential protection departs. The sources say air traffic controllers did not halt nearby commercial flights as required at the time of Marine One’s departure. The Guardian reports that the incident involved a “loss of separation” between the helicopter and a departing passenger jet, suggesting aircraft spacing rules were not followed. Free Malaysia Today similarly reports that commercial flights at the airport were not stopped as required under the relevant safety rules. Investigators are assessing what happened in the moments surrounding the helicopter’s takeoff, including controller actions and coordination between military and civilian air traffic.