About 21% Starlink odds, weighted to recent UA591 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 67 recent flights; Starlink found in 3 of 9 Wi-Fi checks since Jan 17, 2026 (last N69810, Sep 23, 2026).
Aircraft seen on UA591: Boeing 737-900ER, Boeing 737 MAX 8, Boeing 737-700, Boeing 737-900.