About 38% Starlink odds, weighted to recent UA1239 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 82 recent flights; Starlink found in 9 of 13 Wi-Fi checks since Feb 26, 2026 (last N73251, Oct 3, 2026).
Aircraft seen on UA1239: Boeing 737-800, Boeing 737 MAX 9, Boeing 737-900ER, Airbus A320.