AA 5255 then CI 5235 at O'Hare
Dayton → Chicago → Seattle (SEA)
Timetable, Chicago time
08:43AA 5255 from Dayton at the gate
00:55CI 5235 to Seattle (SEA) leaves the gate
16 h 12 apart on the timetable, overnight
CI 5235 leaves 16 h 12 after AA 5255 arrives on the timetable: more than half a day, so not a connection we count.