About 32% Starlink odds, weighted to recent UA663 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 124 recent flights; Starlink found in 8 of 33 Wi-Fi checks since Jan 2, 2026 (last N24508, Sep 21, 2026).
Aircraft seen on UA663: Airbus A321neo, Boeing 737-900ER, Boeing 737 MAX 9, Boeing 757-200.