Southwest Airlines currently has a fleet coverage of 86.2% but is still in the rollout phase with zero aircraft equipped as of the latest verified context. No flights on the SAT->ATL route have confirmed Starlink equipment, and there are no recent news or community sightings supporting Starlink presence. Given the rollout status 'rolling_out' and zero equipped aircraft, the probability is anchored at 0.0 despite the high fleet coverage potential. The confidence in this estimate is high due to strong official announcements and lack of contradictory evidence.