AA 899 then DL 2646 at O'Hare
Los Angeles → Chicago → Boston
Timetable, Chicago time
06:00AA 899 from Los Angeles at the gate
19:10DL 2646 to Boston leaves the gate
13 h 10 apart on the timetable
DL 2646 leaves 13 h 10 after AA 899 arrives on the timetable: more than half a day, so not a connection we count.