AA 3731 then K4 221 at O'Hare
Greenville-Spartanburg → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:01AA 3731 from Greenville-Spartanburg at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
22 h 19 apart on the timetable, overnight
K4 221 leaves 22 h 19 after AA 3731 arrives on the timetable: more than half a day, so not a connection we count.