DL 839 then AA 1974 at DFW
Atlanta → Dallas-Fort Worth → Chicago O'Hare
Timetable, Dallas-Fort Worth time
08:56DL 839 from Atlanta at the gate
06:12AA 1974 to Chicago O'Hare leaves the gate
21 h 16 apart on the timetable, overnight
AA 1974 leaves 21 h 16 after DL 839 arrives on the timetable: more than half a day, so not a connection we count.