AA 3484 then CI 5235 at O'Hare
St Louis → Chicago → Seattle (SEA)
Timetable, Chicago time
12:51AA 3484 from St Louis at the gate
00:55CI 5235 to Seattle (SEA) leaves the gate
12 h 04 apart on the timetable, overnight
CI 5235 leaves 12 h 04 after AA 3484 arrives on the timetable: more than half a day, so not a connection we count.