The U.S. Doomsday Plane (E-4B Nightwatch) landed near D.C. after an unusual flight from Louisiana. It serves as a mobile command post during nuclear or national emergencies. The flight happened as President Trump considers striking Iran's nuclear facilities.

The four E-4s are operated by the 1st Airborne Command and Control Squadron of the 595th Command and Control Group located at Offutt Air Force Base, near Omaha, Nebraska. An E-4 when in action is denoted a "National Airborne Operations Center" (NAOC) and has been nicknamed the "Doomsday plane".

The E-4B is a militarized version of the Boeing 747-200, consisting of four engines, a swept-wing design, and capable of long-range, high-altitude operations and in-flight air refueling. ( U.S. Air Force photo by Tech. Sgt.