SpaceX has been flying regular missions every six months to allow the rotation of ISS crews

A SpaceX rocket soared into the sky Saturday with two passengers on board, leaving two seats empty to return American astronauts who have been stranded for months on the International Space Station, NASA said.

The Falcon 9 rocket took off at 1:17 pm (1717 GMT) from Cape Canaveral, Florida. It used a new launch pad, the pad's first use for a crewed mission.