Live coverage: Falcon 9 set for launch Monday from Cape Canaveral

A European-built Ariane 5 rocket rolled out to a launch pad in the South American jungle Wednesday with a pair of commercial television broadcast satellites for AT&T and Eutelsat, setting the stage for liftoff Thursday evening.

SpaceX scrubbed a launch attempt early Wednesday at Cape Canaveral due to thick cloud cover, then delayed the liftoff of a Falcon 9 rocket with an Airbus-built communications satellite for Arabsat until Friday night to wait for improved weather and to make room for the test-firing of United Launch Alliance’s Vulcan rocket at a neighboring launch pad.

SpaceX will test out new stabilizing fins that could help land the first stage of its Falcon 9 rocket on a floating barge in the Atlantic Ocean after liftoff on a space station resupply mission in mid-December, according to Elon Musk, the company’s billionaire leader.