A U.S. Air Force E-4B “Nightwatch” aircraft — commonly known as the “Doomsday Plane” — landed at Joint Base Andrews late Tuesday night following a highly irregular flight path from Barksdale Air Force Base in Shreveport, Louisiana. The flight sparked speculation given the plane's historical role during major national or global crises. Formally designated as the National Airborne Operations Center (NAOC), the E-4B is built to serve as a mobile command post for the President and top military officials in the event of nuclear war or other catastrophic events.