About 35% Starlink odds, weighted to recent UA550 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 80 recent flights; Starlink found in 11 of 15 Wi-Fi checks since Feb 26, 2026 (last N77580, Oct 17, 2026).
Aircraft seen on UA550: Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800, Boeing 737.