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, there are zero confirmed Starlink observations on the STL->CMH route and no recent news or community sightings to support a higher probability. Perplexity context indicates no aircraft currently equipped as of May 2026, with rollout expected to begin in summer 2026. Given these factors, the probability is conservatively anchored at 0.30, treating the fleet ratio as a floor but not exceeding the empirical observation rate by more than 0.10 without supporting evidence.