Enlarge / Technicians inside United Launch Alliance’s Vertical Integration Facility connect Boeing’s Starliner spacecraft to the top of its Atlas V rocket Tuesday. (credit: United Launch Alliance)

Ground teams on Florida’s Space Coast hoisted Boeing’s Starliner spacecraft atop its United Launch Alliance Atlas V rocket this week, putting all the pieces in place for liftoff next month with two veteran NASA astronauts on a test flight to the International Space Station.

This will be the first time astronauts fly on Boeing’s Starliner crew capsule, following two test flights without crew members in 2019 and 2022. The Starliner Crew Flight Test (CFT) next month will wrap up a decade and a half of development and, if all goes well, will pave the way for operational Starliner missions to ferry crews to and from the space station.

Starliner is running years behind schedule and over budget. SpaceX’s Crew Dragon spacecraft has flown all of NASA’s crew rotation missions to the station since its first astronaut flight in 2020. But NASA wants to get Boeing’s spacecraft up and running to have a backup to SpaceX. It would then alternate between Starliner and Crew Dragon for six-month expeditions to the station beginning next year.