F9 3136 then G7 3376 at O'Hare
Houston → Chicago → St Louis
Timetable, Chicago time
19:59F9 3136 from Houston at the gate
11:00G7 3376 to St Louis leaves the gate
15 h 01 apart on the timetable, overnight
G7 3376 leaves 15 h 01 after F9 3136 arrives on the timetable: more than half a day, so not a connection we count.