About 58% Starlink odds, weighted to recent UA1573 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 93 recent flights; Starlink found in 6 of 23 Wi-Fi checks since Jan 2, 2026 (last N17233, Oct 5, 2026).
Aircraft seen on UA1573: Boeing 737-800, Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737 MAX 8.