SpaceX put the final countdown in the books for the Space Coast early Tuesday adding one more to the record pace of launches for the year. A Falcon 9 rocket carrying 21 Starlink satellites lifted off from Kennedy Space Center’s Launch Pad 39-A at 12:39 a.m. The first-stage booster flew for the 16th time having previously flown the Crew-6 mission among its 15 other flights.