About 55% Starlink odds, weighted to recent UA1583 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 156 recent flights; Starlink found in 14 of 30 Wi-Fi checks since Jan 2, 2026 (last N14520, Oct 9, 2026).
Aircraft seen on UA1583: Airbus A321neo, Boeing 737-800, Boeing 737-900ER, Airbus A320.