About 33% Starlink odds, weighted to recent UA1921 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 99 recent flights; Starlink found in 9 of 13 Wi-Fi checks since Aug 10, 2026 (last N14559, Sep 26, 2026).
Aircraft seen on UA1921: Boeing 737-900ER, Airbus A321neo, Boeing 737-800, Boeing 787-9.