[2] The capsule carried approximately 245 kg (540 lb) of supplies and test equipment to simulate future missions with astronauts and their cargo on board.

[3] Some of the cargo included flags from historically black colleges and universities and pins of Rosie the Riveter and 16 EMU water absorption pads.

[9] The second Atlas V N22,[a] designated AV-082, launched the Starliner spacecraft on its second uncrewed test flight to the International Space Station.

The capsule docked with the space station, then returned to Earth to land in the Western United States after an orbital shakedown cruise ahead of Boeing Crewed Flight Test.

The dual-engine Centaur uses two RL10s and is required for Starliner flights in order to provide a launch trajectory that allows a safe abort at any point in the mission.

On 29 July 2021, the Atlas V with the Starliner atop had just been rolled out from the Vertical Integration Facility (VIF) to the pad at Cape Canaveral Space Launch Complex 41.

In an entirely separate mission, the Nauka module had docked at the space station earlier that morning, but its thrusters misfired, causing serious problems that made the ISS unable to receive the OFT-2 visit until they were corrected.

[22] Due to unexpected valve position indications in the Starliner propulsion system, the launch was further delayed to later in August while engineering teams investigated the problem.

[23] On 13 August 2021, Boeing decided to return the spacecraft back to the Commercial Crew and Cargo Processing Facility in order to perform a deeper-level troubleshooting of the thirteen propulsion system valves, causing the launch to be delayed for another year.