UA 5192 then AA 3731 at O'Hare
Jacksonville → Chicago → Greenville-Spartanburg
Timetable, Chicago time
15:30UA 5192 from Jacksonville at the gate
13:10AA 3731 to Greenville-Spartanburg leaves the gate
21 h 40 apart on the timetable, overnight
AA 3731 leaves 21 h 40 after UA 5192 arrives on the timetable: more than half a day, so not a connection we count.