Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, indicating a strong likelihood of Starlink installation on their aircraft soon. However, there are zero observed flights with confirmed Starlink on the MCO->MHT route, and no recent news or community sightings to support a higher probability. Given the rollout status and high fleet coverage, the probability is anchored at a conservative floor of 0.30, reflecting the airline's announced rollout plans but lack of direct route evidence.