About 33% Starlink odds, weighted to recent UA2399 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 102 recent flights; Starlink found in 4 of 6 Wi-Fi checks since Jan 2, 2026 (last N26208, Oct 17, 2026).
Aircraft seen on UA2399: Boeing 737-800, Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737.