Watch a replay of the launch of a SpaceX Falcon 9 rocket from Cape Canaveral shortly after midnight Monday with the SES 12 communications satellite. For example, the first stage of the recently debuted "Block 5" Falcon 9 is created to fly 10 times with just inspections between touchdown and liftoff, and 100 times or more with some refurbishment in the mix, Musk has said.
Air Force and weather officials predict a 70 percent chance of good launch weather.
Falcon 9 took off at 12:45 am from the Launch Complex.
SES was the first company to fly a spacecraft on a used Falcon 9 rocket booster.
The company had delayed the launch over the weekend, tweeting on Thursday that it was "standing down" a Friday morning attempt to run additional tests on the second stage booster.
SpaceX has also tried several times to snatch Falcon 9 nose cones out of the sky with a net-equipped boat called Mr. Steven, so that these $6 million pieces of equipment can be reused. So far, only the first stages have been landed and launched again.
SES-12 is capable of broadcasting and providing broadband data services focused on the high-growth Asia-Pacific region.
SpaceX's next launch is a cargo resupply mission to the International Space Station, set for the end of the month.