SpaceX cleared to fly Falcon 9 rocket after landing mishap

US regulators on Friday cleared SpaceX to restart launching its stalwart Falcon 9 rocket, as a probe continues into a rare mishap this week during a first-stage booster landing. The Federal Aviation Administration (FAA) grounded the Falcon 9 rocket on Wednesday after a first-stage booster tipped over and exploded while attempting to land on a droneship off the Florida coast.