AA 3059 then UA 3376 at O'Hare
San Antonio → Chicago → St Louis
Timetable, Chicago time
17:54AA 3059 from San Antonio at the gate
11:00UA 3376 to St Louis leaves the gate
17 h 06 apart on the timetable, overnight
UA 3376 leaves 17 h 06 after AA 3059 arrives on the timetable: more than half a day, so not a connection we count.