AA 2515 then K4 221 at O'Hare
Portland (Oregon) → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
19:35AA 2515 from Portland (Oregon) at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
15 h apart on the timetable, overnight
K4 221 leaves 15 h after AA 2515 arrives on the timetable: more than half a day, so not a connection we count.