UA 307 then AA 3646 at O'Hare
Minneapolis → Chicago → Tulsa
Timetable, Chicago time
07:44UA 307 from Minneapolis at the gate
19:45AA 3646 to Tulsa leaves the gate
12 h 01 apart on the timetable
AA 3646 leaves 12 h 01 after UA 307 arrives on the timetable: more than half a day, so not a connection we count.