Only 21 B-2s were ever built, each carrying a price tag of over $2 billion—excluding maintenance and operational costs. This price includes the high-grade stealth materials, precision avionics, and decades of cutting-edge research. Each aircraft is named “Spirit of [U.S. State],” such as the "Spirit of New York" or "Spirit of Ohio," giving each one a unique identity. The rarity and value of the B-2 make every mission a monumental event in the U.S. Air Force.