The B-21 Raider has completed its first aerial refueling tests, according to Northrop Grumman, which did not disclose when the activity took place.
Images released by the company show the stealth bomber taking fuel from a Boeing KC-135 Stratotanker. The tests allow longer sorties and open the way for further evaluation of onboard systems under extended flight conditions.
Northrop said the test campaign now involves multiple aircraft, with flights covering handling, performance and systems checks. The company also indicated that recent sorties have returned without significant maintenance findings between flights.
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The B-21 is described as a sixth-generation military aircraft and is intended to replace part of the current US bomber fleet, including the Boeing B-1B Lancer and the Northrop B-2 Spirit, while remaining in service alongside the Boeing B-52 Stratofortress.
Technical details about the aircraft remain unknown. Flight testing takes place at Edwards Air Force Base, and manufacturing occurs at Air Force Plant 42, where the B-21 first flew in November 2023. Only two aircraft have been publicly observed in flight, although the total number in testing has not been disclosed.
Northrop Grumman said it has invested more than $5 billion in digital engineering and manufacturing infrastructure tied to the program. The company also stated that the aircraft uses a more fuel-efficient design than earlier generations of combat aircraft. Images released so far indicate a smaller airframe than the B-2, despite a similar flying-wing configuration.
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The US Air Force plans to acquire at least 100 aircraft. The B-21 is expected to enter service later this decade, with the first operational units scheduled to be based at Ellsworth Air Force Base from 2027.
