About 20% Starlink odds, weighted to recent UA1999 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 111 recent flights; Starlink found in 6 of 12 Wi-Fi checks since Mar 28, 2026 (last N54543, Sep 15, 2026).
Aircraft seen on UA1999: Boeing 737 MAX 8, Airbus A321neo, Boeing 737-900ER, Boeing 737 MAX 9.