Live coverage: Two telecom satellites launched by Falcon 9, booster recovery fails

Watch the pre-launch news conference on the SpaceX Falcon 9 rocket flight of the Dragon cargo craft to the International Space Station.

SpaceX kept an upgraded Falcon 9 rocket on the ground Thursday after running into a problem loading super-cold liquid propellants into the launcher’s fuel tanks, postponing blastoff of a commercial communications satellite for the second day in a row.

SpaceX’s fifth launch of replacement spacecraft for Iridium’s global voice and data communications network is set for March 29 from Vandenberg Air Force Base in California, a flight that Iridium hopes will signal the start of a brisk pace of West Coast missions to complete deployment of the telecom company’s initial 75-satellite constellation this summer.