AA 4600 then DL 2646 at O'Hare
Indianapolis → Chicago → Boston
Timetable, Chicago time
07:15AA 4600 from Indianapolis at the gate
19:45DL 2646 to Boston leaves the gate
12 h 30 apart on the timetable
DL 2646 leaves 12 h 30 after AA 4600 arrives on the timetable: more than half a day, so not a connection we count.