AA 4479 then QF 7554 at O'Hare
Pittsburgh → Chicago → Dallas-Fort Worth
Timetable, Chicago time
14:00AA 4479 from Pittsburgh at the gate
13:37QF 7554 to Dallas-Fort Worth leaves the gate
23 h 37 apart on the timetable, overnight
QF 7554 leaves 23 h 37 after AA 4479 arrives on the timetable: more than half a day, so not a connection we count.