The E-4B is the US Air Force’s militarized version of a Boeing 747 and it towers 63.5 feet above members of the US Air Combat Command Security Forces guarding it during a trip to South Korea in 2013Jacquelyn Martin-Pool/Getty Images
While there are only four of these specialized planes, each one is kept at the Offutt Air Force Base in Nebraska. This base is also the home of the U.S. Strategic Command, highlighting the importance of these aircraft in national security.
An air-to-air right side view of an E-4B advanced airborne national command post aircraft being refueled from a KC-135 Stratotanker aircraftUSAF
The cost of one E-4B? A jaw-dropping $223.2 million. At any given time, at least one of these planes is on standby 24/7, ready to provide immediate support to the President, the Secretary of Defense, and the Joint Chiefs of Staff.