The US Air Force has revealed the truth behind 'doomsday plane' and why it made a 'highly unusual flight' this week.

The US Air Force E-4B 'Nightwatch' aircraft is designed to transport the president and withstand a nuclear blast.

A retired NASA flight surgeon said he saw footage of a 20-foot-wide flying saucer emblazoned with the US Air Force logo performing deft maneuvers in a military hangar more than 30 years ago ...

The United States Air Force ... sight to see at various air shows and special events, showing off the aerodynamic capabilities of some of the Air Force's most agile aircraft, and these days ...

Since 1970, the US Air Force's C-5 cargo planes have carried troops and gear all over the world. The C-5 is the Air Force's biggest plane, and the latest model can haul 281,000 pounds and fly 518 mph.