The B-21 Raider has so far avoided ballooning costs, said Air Force Chief of Staff Gen. David Allvin.
The Air Force is rethinking its approach to air dominance, which Northrop Grumman thinks could show whether more B-21s are in the cards.
Whiteman Air Force Base, Missouri, and Dyess Air Force Base, Texas, will be the second and third bases to receive the U.S. Air Force's newest bomber.
The Pentagon said the "mature" plans for producing the Northrop Grumman-made bomber also contributed to its decision to move forward with production.
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