Took us 4 attempts with Falcon 1: Musk on Virgin Orbit's failed rocket launch

Responding to Billionaire Richard Branson's Virgin Orbit's failed rocket launch, SpaceX CEO Elon Musk said, "Sorry to hear that. Orbit is hard. Took us four attempts with Falcon 1." Previously, Virgin Orbit's attempt to launch a rocket was terminated after an anomaly occurred after rocket's 'clean release' from the aircraft. However, Virgin Orbit's aircraft and its crew landed safely later.