Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, which would normally suggest a high probability of Starlink availability on routes. However, there are zero observed flights with confirmed Starlink on the BWI->SAT route, and the rollout has not yet begun as of the latest data (summer 2026 start). Perplexity context confirms zero equipped aircraft currently. Given the rollout status 'rolling_out' and fleet coverage above 0.30, the probability is anchored to the floor of 0.30, reflecting the fleet coverage but adjusted downward due to no current equipment or observations. No recent news or sightings support a higher probability.