A Russian Soyuz rocket has reached its last stop before liftoff Friday with two Russian cosmonauts and veteran NASA flight engineer Jeff Williams, who is slated to break the record for the most cumulative time spent in space by a U.S. astronaut.

A SpaceX Falcon 9 rocket lifted off from Vandenberg Air Force Base in California at 10:34 a.m. PST (1:34 p.m. EST; 1834 GMT) Monday. The launch, under contract to Spaceflight, carried into orbit 64 small satellites from 17 countries, the largest multi-payload rideshare mission ever flown on a U.S. rocket. The Falcon 9’s first stage booster previously flew on two missions from Florida, and landed again on a drone ship in the Pacific Ocean after Monday’s launch.

After scrubbing a launch attempt Friday, SpaceX launched a Falcon 9 rocket Saturday on a mission to send communications satellites from OneWeb and Iridium into polar orbit from Vandenberg Space Force Base, California. Liftoff occurred at 6:16 a.m. PDT (9:16 a.m. EDT; 1316 UTC).