Four 747-8I jets will be converted into E-4C aircraft to replace the E-4B NAOC fleet

Sierra Nevada beat Boeing to replace the Air Force's E-4B Nightwatch. The task, however, of developing a new airborne survival operations center will not be simple.

Sierra Nevada Corporation was awarded with a contract to develop platform for new Survival Airborne Operations Center (SAOC)

The company reportedly disagreed with the terms of the contract after winning the KC-46A and new Air Force One programs, which have fixed-price values. Sierra Nevada Corporation remains sole participant

Designed to withstand a nuclear attack, Boeing E-4B Nightwatch jets are close to completing 50 years of service with the US Air Force with no replacement in sight.

Updated version of the Ilyushin passenger aircraft is on the final stretch of assembly and will replace the Il-80 as an airborne command of the Russian Air Force