UA 6080 then AA 599 at O'Hare
Sioux City → Chicago → Raleigh-Durham
Timetable, Chicago time
07:35UA 6080 from Sioux City at the gate
21:27AA 599 to Raleigh-Durham leaves the gate
13 h 52 apart on the timetable
AA 599 leaves 13 h 52 after UA 6080 arrives on the timetable: more than half a day, so not a connection we count.