As test pilots for Boeing’s new Starliner capsule, Wilmore and Williams expected to be gone just a week or so when they launched from Cape Canaveral on June 5. A series of helium leaks and thruster failures marred their trip to the space station, setting off months of investigation by NASA and Boeing on how best to proceed.

The SpaceX Crew-10 launch attempt was scrubbed Wednesday from Kennedy Space Center meaning two Boeing Starliner astronauts waiting to come home will have to wait some more.