AA 4042 then DL 2646 at O'Hare
Omaha → Chicago → Boston
Timetable, Chicago time
17:59AA 4042 from Omaha at the gate
16:40DL 2646 to Boston leaves the gate
22 h 41 apart on the timetable, overnight
DL 2646 leaves 22 h 41 after AA 4042 arrives on the timetable: more than half a day, so not a connection we count.