ET 3608 then AA 2548 at O'Hare
Anchorage → Chicago → Philadelphia
Timetable, Chicago time
07:16ET 3608 from Anchorage at the gate
19:20AA 2548 to Philadelphia leaves the gate
12 h 04 apart on the timetable
AA 2548 leaves 12 h 04 after ET 3608 arrives on the timetable: more than half a day, so not a connection we count.