About 47% Starlink odds, weighted to recent UA1390 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 101 recent flights; Starlink found in 17 of 42 Wi-Fi checks since Jan 2, 2026 (last N36272, Sep 29, 2026).
Aircraft seen on UA1390: Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9.