UA 4530 then QF 7554 at O'Hare
Chattanooga → Chicago → Dallas-Fort Worth
Timetable, Chicago time
19:05UA 4530 from Chattanooga at the gate
13:37QF 7554 to Dallas-Fort Worth leaves the gate
18 h 32 apart on the timetable, overnight
QF 7554 leaves 18 h 32 after UA 4530 arrives on the timetable: more than half a day, so not a connection we count.