UA 5336 then AA 3597 at O'Hare
Memphis → Chicago → Huntsville
Timetable, Chicago time
20:17UA 5336 from Memphis at the gate
19:51AA 3597 to Huntsville leaves the gate
23 h 34 apart on the timetable, overnight
AA 3597 leaves 23 h 34 after UA 5336 arrives on the timetable: more than half a day, so not a connection we count.