United Airlines has a fleet coverage of 52.2% Starlink-equipped aircraft, indicating a moderate rollout status. However, there are no confirmed Starlink observations on the IAD->SEA route, and no direct sightings or news specifically mention this route. Recent news confirms Starlink installations on United's mainline and regional fleets, but primarily on other routes such as EWR->LAS and regional US routes. Given the lack of route-specific observations, the probability is anchored to the fleet coverage ratio of 52.2%, reflecting the rolling_out status and moderate confidence in the estimate.

Last calculated May 20, 2026