Southwest Airlines is currently in the announced rollout phase with zero aircraft equipped as of the latest data. The fleet coverage is high at 86.2%, but this reflects planned future installations rather than current status. There are no confirmed Starlink observations or community sightings on the TUS->HOU route, and no recent news indicating active deployment. Given the rollout status is 'rolling_out' but with zero equipped aircraft, the probability of Starlink on this route is effectively zero at this time.