Over 99% Starlink odds, weighted to recent UA5621 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 44 recent flights; Starlink found in 24 of 25 Wi-Fi checks since Jan 2, 2026 (last N608UX, Oct 2, 2026).
Aircraft seen on UA5621: Embraer E-175.