AA 9866 then UA 4419 at O'Hare
Bloomington-Normal → Chicago → St Louis
Timetable, Chicago time
13:11AA 9866 from Bloomington-Normal at the gate
12:55UA 4419 to St Louis leaves the gate
23 h 44 apart on the timetable, overnight
UA 4419 leaves 23 h 44 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.