About 26% Starlink odds, weighted to recent UA1389 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 167 recent flights; Starlink found in 11 of 30 Wi-Fi checks since Jan 2, 2026 (last N27439, Sep 12, 2026).
Aircraft seen on UA1389: Airbus A321neo, Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800.