DL 2879 then AA 1187 at O'Hare
Atlanta → Chicago → Washington National
Timetable, Chicago time
19:05DL 2879 from Atlanta at the gate
18:55AA 1187 to Washington National leaves the gate
23 h 50 apart on the timetable, overnight
AA 1187 leaves 23 h 50 after DL 2879 arrives on the timetable: more than half a day, so not a connection we count.