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TACOMA, WA – JULY 21: Northrop Grumman B-2A Spirit (“Spirit of Ohio”) flyby demonstration during Air Expo at McChord Field Joint Base Lewis-McChord on July 21, 2012 in Tacoma, Washington.

With its "flying wing" design that makes it almost invisible to radar, the B-2 Spirit bomber is truly a standout among military planes -- and also the world's most expensive, at over $2 billion per aircraft.