AA 2550 then QR 8167 at O'Hare
Dallas-Fort Worth → Chicago → Doha
Timetable, Chicago time
07:34AA 2550 from Dallas-Fort Worth at the gate
04:40QR 8167 to Doha leaves the gate
21 h 06 apart on the timetable, overnight
QR 8167 leaves 21 h 06 after AA 2550 arrives on the timetable: more than half a day, so not a connection we count.