About 68% Starlink odds, weighted to recent UA1891 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 98 recent flights; Starlink found in 12 of 16 Wi-Fi checks since Feb 12, 2026 (last N25201, Oct 15, 2026).
Aircraft seen on UA1891: Boeing 737-800, Boeing 737-900ER, Boeing 737-900.