About 67% Starlink odds, weighted to recent UA1912 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 146 recent flights; Starlink found in 18 of 26 Wi-Fi checks since Feb 11, 2026 (last N34535, Oct 16, 2026).
Aircraft seen on UA1912: Airbus A321neo, Boeing 737-900ER, Boeing 737-800, Boeing 737-900.