AA 2158 then AA 1732 at San Francisco
Chicago O'Hare → San Francisco → Philadelphia
Timetable, San Francisco time
00:30AA 2158 from Chicago O'Hare at the gatealso AY 4088, RJ 7305
12:40AA 1732 to Philadelphia leaves the gate
12 h 10 apart on the timetable
AA 1732 leaves 12 h 10 after AA 2158 arrives on the timetable: more than half a day, so not a connection we count.