DL 1007 then UA 2657 at Atlanta
Washington National → Atlanta → Chicago O'Hare
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
18:44UA 2657 to Chicago O'Hare leaves the gate
21 h 03 apart on the timetable, overnight
UA 2657 leaves 21 h 03 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.