F9 45 then QF 7554 at O'Hare
Cancún → Chicago → Dallas-Fort Worth
Timetable, Chicago time
14:45F9 45 from Cancún at the gate
13:37QF 7554 to Dallas-Fort Worth leaves the gate
22 h 52 apart on the timetable, overnight
QF 7554 leaves 22 h 52 after F9 45 arrives on the timetable: more than half a day, so not a connection we count.