About 43% Starlink odds, weighted to recent UA5591 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 51 recent flights; Starlink found in 10 of 11 Wi-Fi checks since Jan 23, 2026 (last N87367, Sep 21, 2026).
Aircraft seen on UA5591: Bombardier CRJ-200, Embraer E-175.