AA 3620 then UA 4405 at O'Hare
Huntsville → Chicago → Springfield Branson National
Timetable, Chicago time
08:30AA 3620 from Huntsville at the gate
21:20UA 4405 to Springfield Branson National leaves the gate
12 h 50 apart on the timetable
UA 4405 leaves 12 h 50 after AA 3620 arrives on the timetable: more than half a day, so not a connection we count.