The Air Force is expected to build 100 of the aircraft, some with pilots and some without, which will combine with Boeing's B-52 strategic bombers to replace the existing fleet of B-1 and B-2 bombers.

The Air Force said the "B-21" designation was chosen because the aircraft is the first new bomber of the 21st century, while the name "Raider" was selected to represent the Doolittle Raiders, who ...

The B-2 Spirit Bomber, Northrop Grumman's stealth bomber built in the 1990s, was plagued by cost overruns and is one of the world's most expensive aircraft to operate.