UA 3874 then AA 4930 at O'Hare
Chicago → Chicago → Oklahoma City
Timetable, Chicago time
01:21UA 3874 from Chicago at the gate
16:15AA 4930 to Oklahoma City leaves the gate
14 h 54 apart on the timetable
AA 4930 leaves 14 h 54 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.