Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, but no aircraft are yet equipped with Starlink as of the latest verified context. There are zero confirmed observations on the BNA->ISP route, and no recent news or community sightings to suggest active deployment. Given the rollout status and high fleet coverage, the probability is anchored conservatively at 0.30, reflecting the announced rollout beginning summer 2026 and expected fleet upgrades, but not exceeding the empirical observation rate of 0.0 by more than 0.10 without direct evidence.