Southwest Airlines is currently in a rolling_out status with a high fleet coverage ratio of 86.2%, which generally supports a high probability of Starlink availability. However, there are zero observed flights with confirmed Starlink on the BUF->LAS route, and no recent news or community sightings to increase confidence. Perplexity context indicates no aircraft currently equipped as of May 2026, with rollout expected to begin in summer 2026. Given the rollout status and fleet coverage, the fleet ratio acts as a floor, but the lack of observations and confirmed equipment suggests a conservative probability anchored at 0.30, reflecting the announced rollout but no current deployment.