The company behind the U.S. Air Force's new so-called "Doomsday" planes revealed details Wednesday of how it was developing the aircraft designed to withstand a nuclear blast.

The aircraft - which can seat up to 111 people - are capable of withstanding nuclear blasts and electromagnetic pulses, according to officials.

These aircraft are equipped with mobile command centres, operations areas, conference rooms and more and can also resist electromagnetic pulses. They would carry the US President and top military leaders in the event of a national emergency.

Rolls-Royce has been chosen to supply technology for a new version of the American military aircraft nicknamed the “Doomsday plane” for its ability to survive a nuclear blast.

The five former Korean Air B-747-8s are likely going to be converted for the replacement of the U.S. Air Force E-4B Nightwatch “Doomsday” plane. Korean

A contract to upgrade America’s “doomsday planes” has been handed to Rolls-Royce. The United States has a fleet of four customised Boeing 747 or Boeing-E4 jets, formally known as the Survivable Airborne Operations Center.