Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, which would normally suggest a high probability of Starlink presence on routes. However, perplexity-verified context indicates that as of May 2026, Southwest has not yet equipped any aircraft with Starlink, and there are zero confirmed observations or community sightings on the MCI->STL route. No recent news updates support earlier deployment. Given the announced rollout start in summer 2026 and no current equipped aircraft, the probability remains at zero despite the high fleet coverage ratio, reflecting the current lack of deployment rather than incomplete data.