Each B-21 raider is projected to cost roughly $729.25 million and the US Air Force has planned to buy at least 100 of the planes.
The US' newest high-tech nuclear stealth bomber has made its debut after years of secret development.
Each aircraft, which carries a similar 'flying wing' shape to its predecessor, the B-2, is projected to cost roughly $729.25 million. The aircraft is part of the Pentagon's efforts to modernise all three legs of its nuclear triad - which includes silo-launched nuclear ballistic missiles and submarine-launched warheads, as it shifts from the counterterrorism campaigns of recent decades to meet China's rapid military modernisation.China is on track to have 1,500 nuclear weapons by 2035.
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