About 72% Starlink odds, weighted to recent UA1801 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 98 recent flights; Starlink found in 11 of 31 Wi-Fi checks since Mar 13, 2026 (last N34535, Sep 26, 2026).
Aircraft seen on UA1801: Airbus A321neo, Boeing 737-900ER, Airbus A321.