Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, which normally would anchor the probability near that level. However, there are zero observed flights with confirmed Starlink on the CHS->AUS route and no recent news or sightings to support a higher probability. The perplexity context indicates no aircraft currently equipped as of May 2026, with rollout starting summer 2026. Given the rollout status and fleet coverage, the probability is anchored conservatively at 0.30, reflecting the start of rollout but no confirmed route-specific evidence yet.