About 17% Starlink odds, weighted to recent UA1900 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 122 recent flights; Starlink found in 4 of 27 Wi-Fi checks since Jan 2, 2026 (last N37537, Oct 1, 2026).
Aircraft seen on UA1900: Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737 MAX 8, Boeing 737-900.