DL 1007 then UA 1288 at Atlanta
Washington National → Atlanta → Chicago O'Hare
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
11:11UA 1288 to Chicago O'Hare leaves the gate
13 h 30 apart on the timetable, overnight
UA 1288 leaves 13 h 30 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.