AA 91 then QR 8187 at O'Hare
London → Chicago → Houston
Timetable, Chicago time
19:30AA 91 from London at the gate
16:40QR 8187 to Houston leaves the gate
21 h 10 apart on the timetable, overnight
QR 8187 leaves 21 h 10 after AA 91 arrives on the timetable: more than half a day, so not a connection we count.