UA 6080 then AA 3597 at O'Hare
Sioux City → Chicago → Huntsville
Timetable, Chicago time
07:35UA 6080 from Sioux City at the gate
19:51AA 3597 to Huntsville leaves the gate
12 h 16 apart on the timetable
AA 3597 leaves 12 h 16 after UA 6080 arrives on the timetable: more than half a day, so not a connection we count.