Boeing Crew Flight Test (Boe-CFT) will be the first crewed mission of the Boeing Starliner and the third orbital flight test of the Starliner overall after the two uncrewed orbital flight tests, Boe-OFT and Boe-OFT 2 in 2019 and 2022. The flight was scheduled for liftoff at 2:34 on 7 May UTC (May 6, 2024 at 10:34 PM EDT time), but was scrubbed about two hours before liftoff. The cause of the 6 May 2024 mission scrub was due to an oxygen valve problem on the United Launch Alliance's (ULA) Atlas V, and not due to any anomaly on the Starliner portion of the rocket.