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How much money did it take to buy the worlds most expensive airplane? The B-2 spirit is the only operational stealth bomber, and its pricetag is well-known to be one of the biggest. The B-2 was developed from 1979 when the United States was developing the B-2 as a top-secret cold war project. Because of its use of flying wings combined with radar absorbant material, it is nearly impossible to detect by radar.