About 99% Starlink odds, weighted to recent UA5251 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 75 recent flights; Starlink found in 18 of 21 Wi-Fi checks since Jan 2, 2026 (last N108SY, Sep 30, 2026).
Aircraft seen on UA5251: Embraer E-175, Bombardier CRJ-200.