About 71% Starlink odds, weighted to recent UA1580 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 130 recent flights; Starlink found in 12 of 20 Wi-Fi checks since Feb 11, 2026 (last N78509, Sep 19, 2026).
Aircraft seen on UA1580: Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9, Airbus A319.