AA 9866 then UA 4393 at O'Hare
Bloomington-Normal → Chicago → Tulsa
Timetable, Chicago time
13:11AA 9866 from Bloomington-Normal at the gate
12:45UA 4393 to Tulsa leaves the gate
23 h 34 apart on the timetable, overnight
UA 4393 leaves 23 h 34 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.