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 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, , on Monday evening.The E-4B carried out a training flight with other specialist military aircraft, reports the newspaper.
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