DL 2879 then AA 383 at O'Hare
Atlanta → Chicago → Pittsburgh
Timetable, Chicago time
19:05DL 2879 from Atlanta at the gate
18:17AA 383 to Pittsburgh leaves the gate
23 h 12 apart on the timetable, overnight
AA 383 leaves 23 h 12 after DL 2879 arrives on the timetable: more than half a day, so not a connection we count.