In September 2014 Boeing was one of two companies selected by NASA to develop crewed spacecraft to ferry astronauts to the International Space Station, the other being SpaceX.

[2] Instead, the spacecraft remained in orbit for two days, performing as many tests as possible without the ISS rendezvous, and landed at White Sands Missile Range, New Mexico on 22 December 2019.

Although Calypso was initially scheduled to return to space on Starliner-1, Boeing announced in March 2020 that they would refly the Orbital Flight Test as OFT-2, which rearranged the spacecraft assignments for subsequent missions.

[5][6] An overactive oxygen valve on the Centaur upper stage of the Atlas V rocket led to the launch being delayed by one day.

[7][8] The flight was scheduled for liftoff at 2:34 UTC on 7 May 2024, but was scrubbed about two hours before liftoff due to an oxygen valve problem on the United Launch Alliance's (ULA) Atlas V.[b][9][10] After the initial scrub, the launch was repeatedly delayed due to a helium leak in the Starliner service module.