Southwest Airlines is currently in a rolling_out status with a high fleet coverage ratio of 86.2%, which normally would anchor the probability near this value. However, no flights have been observed with Starlink on the BWI->ONT route, and the perplexity-verified context indicates zero aircraft currently equipped, with rollout starting in summer 2026. No recent news or community sightings support higher probability. Given the rollout status and fleet coverage, the probability is anchored conservatively at 0.30, reflecting the floor for rolling_out airlines with high fleet coverage but no current observations or confirmed equipment.