About 85% Starlink odds, weighted to recent UA5521 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 61 recent flights; Starlink found in 6 of 8 Wi-Fi checks since Mar 17, 2026 (last N113SY, Nov 1, 2026).
Aircraft seen on UA5521: Embraer E-175, Bombardier CRJ-550.