AA 3881 then UA 3376 at O'Hare
Albuquerque → Chicago → St Louis
Timetable, Chicago time
18:14AA 3881 from Albuquerque at the gate
11:00UA 3376 to St Louis leaves the gate
16 h 46 apart on the timetable, overnight
UA 3376 leaves 16 h 46 after AA 3881 arrives on the timetable: more than half a day, so not a connection we count.