A Federal Flight Deck Officer (FFDO) is a Part 121 Airline Pilot who is trained and licensed to carry weapons and defend commercial aircraft against criminal activity and terrorism. The Federal Flight Deck Officer program is run by the Federal Air Marshal Service, and an officer's jurisdiction is the flight deck or cabin of a commercial airliner or a cargo aircraft while on duty. FFDOs are federal law enforcement officers sworn and deputized by the U.S. Department of Homeland Security.[1]