Trump Marine One flight under investigation after potential safety mishap

Federal aviation officials are investigating an air-safety incident involving President Trump's Marine One helicopter in Washington, D.C. Why it matters: The incident comes as regulators work to improve safety in increasingly congested U.S. airspace, particularly around D.C. Zoom in: The Wall Street Journal first reported that the helicopter was carrying Trump on Tuesday when it flew too close to a commercial airliner departing from Ronald Reagan Washington National Airport. NTSB confirmed in…