AA 4330 then UA 3376 at O'Hare
Springfield (SPI) → Chicago → St Louis
Timetable, Chicago time
16:30AA 4330 from Springfield (SPI) at the gate
11:00UA 3376 to St Louis leaves the gate
18 h 30 apart on the timetable, overnight
UA 3376 leaves 18 h 30 after AA 4330 arrives on the timetable: more than half a day, so not a connection we count.