Overview

• The countdown was halted at T-minus 11 seconds without explanation, prompting a scrub of Monday’s launch attempt.
• The backup window opens Tuesday at 5:12 p.m. EDT, but the 45th Weather Squadron forecasts only a 25% chance of acceptable conditions.
• The mission carries SES’s ninth and tenth O3b mPOWER satellites, which use Boeing’s software-defined payloads to boost medium-Earth orbit connectivity.
• Falcon 9 booster B1090, set for its sixth flight, was to attempt a landing on the droneship Just Read the Instructions about 8.5 minutes after liftoff.
• The aborted launch underscores SpaceX’s reliance on rapid turnaround and reusable rockets to expand commercial satellite networks.