Four specially modified Boeing 747s — dubbed the E-4Bs or 'Doomsday planes' (pictured) — carry high-ranking members of the US Government around the world. This image shows an E-4B aircraft is towed out of its hangar June 17, 2009, at Offutt Air Force Base, Nebraska
* Military flight tracking sites showed the modified Boeing 747 had departed from US Air Force base in Lincoln, Nebraska, on Monday
* The E-4B carried out a training flight with other specialist military aircraft
* The planes are outfitted as complete command centre for president and top officials in case of nuclear war or national emergency
Air Force One's little-known sister aircraft the 'Doomsday Plane' - designed to protect high-ranking government officials from a nuclear attack - was sent on a four-hour training flight after Vladimir Putin placed Russia's nuclear forces on high alert.
Military flight tracking sites showed the modified Boeing 747 had departed from the US Air Force base in Lincoln, Nebraska, on Monday evening. The E-4B carried out a training flight with other specialist military aircraft, reports the i newspaper.
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WNU Editor: U.S. officials are saying that they have not raised America''s Defcon level, that everything is OK. But their actions are saying the opposite.
America's 'Doomsday' Plane Was Sent On A Four-Hour Training Flight After Putin Placed Russia's Nuclear Forces On High Alert
WAR BIRD USA’s ‘doomsday plane’ built to withstand NUCLEAR war takes flight in ‘training mission’ -- The SUN
US ‘doomsday plane’ made four-hour flight following Putin’s nuclear weapons threat -- iNews
America's nuke-resistant 'doomsday plane' spotted doing training mission over Nebraska -- Live Science