UA 3874 then AA 3792 at O'Hare
Chicago → Chicago → Asheville
Timetable, Chicago time
01:21UA 3874 from Chicago at the gate
13:23AA 3792 to Asheville leaves the gate
12 h 02 apart on the timetable
AA 3792 leaves 12 h 02 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.