The Federal Aviation Administration is reviewing a possible breach of safety protocol after an incident involving Marine One, the helicopter that transports the US president, and a commercial aircraft while Donald Trump was aboard. The review comes amid heightened scrutiny of US air traffic safety, with officials warning that risks appear to be rising more broadly across the aviation system.

Transportation Secretary Sean Duffy separately said FAA data shows an increase in "loss of separation" incidents and runway incursions between aircraft, which he linked to disruption from an ongoing government shutdown. Further specifics of the Marine One incident, including exactly what protocol may have been breached, have not yet been detailed publicly.