UA 6080 then AA 3561 at O'Hare
Sioux City → Chicago → Little Rock
Timetable, Chicago time
07:35UA 6080 from Sioux City at the gate
20:30AA 3561 to Little Rock leaves the gate
12 h 55 apart on the timetable
AA 3561 leaves 12 h 55 after UA 6080 arrives on the timetable: more than half a day, so not a connection we count.