The four members of the SpaceX Crew-11 flight were previously set to fly on different missions before they ended up as a quartet on the Dragon Endeavour spacecraft. Liftoff of the Falcon 9 rocket from pad 39A at NASA’s Kennedy Space Center is scheduled for no earlier than Friday, Aug. 1, at 11:43 a.m. EDT (1543 UTC).

A SpaceX Falcon 9 rocket lifted off Thursday from NASA’s Kennedy Space Center in Florida with the U.S. Air Force’s X-37B mini-shuttle, an unpiloted orbiting military laboratory. Liftoff occurred at 10 a.m. EDT (1400 GMT), and the Falcon 9’s first stage booster successfully landed at Cape Canaveral a few minutes later.

With a thundering, sky-lighting predawn blastoff from Cape Canaveral, a Falcon 9 rocket fired into orbit early Saturday with a Dragon cargo capsule in pursuit of the International Space Station. Minutes later, the rocket’s first stage booster fell from the sky and executed a pinpoint propulsive landing just offshore, setting the stage for another resupply mission for NASA this summer using the same vehicle.