United Airlines has an installed rollout status with a fleet coverage of 36.7%, which sets a floor for the probability at 0.367. Although there are zero confirmed Starlink observations on the BUF->DEN route, this is likely due to incomplete flight tracking data rather than absence of Starlink equipment. Recent high-confidence news confirms active Starlink deployment on United's mainline and regional fleets, including inaugural flights with Starlink WiFi. Community sightings also confirm completion of rollout on regional US routes. Given the lack of direct route observations but strong fleet and news evidence, the probability is anchored at the fleet coverage floor without upward adjustment.