AA 1838 then K4 221 at O'Hare
Dallas-Fort Worth → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:30AA 1838 from Dallas-Fort Worth at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
16 h 05 apart on the timetable, overnight
K4 221 leaves 16 h 05 after AA 1838 arrives on the timetable: more than half a day, so not a connection we count.