UA 3874 then AA 3510 at O'Hare
Chicago Rockford → Chicago → Traverse City
Timetable, Chicago time
01:21UA 3874 from Chicago Rockford at the gate
13:45AA 3510 to Traverse City leaves the gate
12 h 24 apart on the timetable
AA 3510 leaves 12 h 24 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.