SpaceX launched the Starlink 4-2 rideshare mission on Saturday, September 10, 2022, at 9:20 PM EDT (01:20 UTC on September 11) from Launch Complex 39A (LC-39A) at Kennedy Space Center in Cape Canaveral, Florida. Onboard Falcon 9 were 34 SpaceX Starlink satellites and the BlueWalker 3 prototype satellite for AST SpaceMobile’s cellular broadband constellation.
The weather forecast for the mission showed a 60% chance of acceptable weather on Saturday night. Weather criteria being watched included the Cumulus Cloud, Anvil Cloud, and Surface Electric Fields rules. The weather did prompt a minor 10-minute delay to the launch. If the mission had been delayed to Sunday night, there was a slightly better forecast of a 70% chance of acceptable weather.