How many b-21 will be built?

When the Long Range Strike Bomber contract was awarded to Northrop Grumman in October 2015, the US Air Force set a requirement for a minimum of 100 aircraft. That figure has survived every budget cycle since. It is a floor rather than a ceiling: the service has never published a formal maximum, and the contract structure, with fixed-price low-rate production lots, allows the quantity to be adjusted lot by lot.

The first B-21 Raider was unveiled at Palmdale in December 2022 and flew in November 2023. Low-rate initial production was approved in early 2024, and a second test aircraft joined the flight programme in 2025. Northrop Grumman has said its Palmdale line is sized for a modest rate, on the order of a handful of aircraft per year, which is why even 100 airframes will take well into the 2030s to deliver.

Several Air Force leaders, including the head of Global Strike Command, have argued that 100 is too few for a two-theatre strategy, and a figure of about 145 has circulated in congressional testimony and think-tank studies. In 2025 Congress added money specifically to expand production capacity, a step that would be needed before any larger buy. Even so, the official requirement remained 100 as of September 2026, and any increase would need a formal decision in the budget.

The B-21 will replace the B-1B and B-2A fleets outright and eventually take over from the B-52J, so the final quantity determines the size of the entire US bomber force for decades. The unit cost, roughly $700 million in 2022 dollars for the average production aircraft, also depends on volume: a larger buy spreads fixed costs and lowers the price of each airframe, one of the main arguments used by those who want more than 100.