AA 2273 then G7 3376 at O'Hare
San Diego → Chicago → St Louis
Timetable, Chicago time
14:00AA 2273 from San Diego at the gate
11:00G7 3376 to St Louis leaves the gate
21 h apart on the timetable, overnight
G7 3376 leaves 21 h after AA 2273 arrives on the timetable: more than half a day, so not a connection we count.