CV 78 then AA 4504 at O'Hare
Dallas-Fort Worth → Chicago → Philadelphia
Timetable, Chicago time
20:02CV 78 from Dallas-Fort Worth at the gate
19:59AA 4504 to Philadelphia leaves the gate
23 h 57 apart on the timetable, overnight
AA 4504 leaves 23 h 57 after CV 78 arrives on the timetable: more than half a day, so not a connection we count.