The Federal Aviation Administration (FAA) is investigating a safety incident involving a Marine One helicopter carrying US President Donald Trump. “The FAA is investigating a safety incident involving Marine One, but it didn’t appear to be a dangerous close call, and the aircraft weren’t apparently converging,” the FAA told Reuters. Markus Mainka / Shutterstock.comPresident Donald Trump’s Marine One departed from the Ellipse, close to the White House, minutes after, according to Reuters. FAA rules require at least 1.5 nautical miles or 500 feet of separation between aircraft in Class B airspace like Reagan National’s. It appears that the Marine One helicopter and the Embraer E175LR did not follow that rule.