UA 3874 then AA 716 at O'Hare
Chicago Rockford → Chicago → Philadelphia
Timetable, Chicago time
01:21UA 3874 from Chicago Rockford at the gate
17:47AA 716 to Philadelphia leaves the gate
16 h 26 apart on the timetable
AA 716 leaves 16 h 26 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.