About 68% Starlink odds, weighted to recent UA5638 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 49 recent flights; Starlink found in 6 of 9 Wi-Fi checks since Mar 25, 2026 (last N131SY, Sep 18, 2026).
Aircraft seen on UA5638: Embraer E-175, Bombardier CRJ-550, Bombardier CRJ-200.