AA 2453 then DL 2804 at Boston
Los Angeles → Boston → Chicago O'Hare
Timetable, Boston time
07:47AA 2453 from Los Angeles at the gate
20:55DL 2804 to Chicago O'Hare leaves the gate
13 h 08 apart on the timetable
DL 2804 leaves 13 h 08 after AA 2453 arrives on the timetable: more than half a day, so not a connection we count.