Southwest Airlines is currently in the rolling_out phase with a very high fleet coverage ratio of 86.2%, which would normally suggest a high probability of Starlink presence on routes. However, perplexity-verified context and recent data confirm that as of mid-2026, Southwest has not yet equipped any aircraft with Starlink. There are zero confirmed observations or sightings on the RDU->SAT route, and no recent news indicating active deployment. Given the announced rollout start in summer 2026 and zero current equipment, the probability must be anchored at zero despite the high fleet coverage ratio, reflecting the current lack of deployment rather than potential future coverage.