About 49% Starlink odds, weighted to recent UA729 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 120 recent flights; Starlink found in 4 of 8 Wi-Fi checks since Jan 15, 2026 (last N24573, Sep 20, 2026).
Aircraft seen on UA729: Airbus A321neo, Boeing 737 MAX 8, Airbus A321.