Rocket Lab says the first stage of its Electron launcher splashed down under parachute in the Pacific Ocean off New Zealand after firing into space with 30 small satellites Thursday, becoming only the second private company to return an orbital-class booster to Earth intact.

At Cape Canaveral’s Vertical Integration Facility, adjacent to the Complex 41 launch pad, workers with United Launch Alliance stacked the Atlas 5 rocket that will propel NASA’s OSIRIS-REx spacecraft on its voyage to Asteroid Bennu.

SpaceX is readying two Falcon 9 rockets for a pair of flights nine hours apart Sunday from separate pads along Florida’s Space Coast. Weather permitting, the back-to-back departures Sunday would mark shortest span between two orbital-class launches from Cape Canaveral since 1966.