UA 2838 then AA 3597 at O'Hare
New York LaGuardia → Chicago → Huntsville
Timetable, Chicago time
20:08UA 2838 from New York LaGuardia at the gate
19:51AA 3597 to Huntsville leaves the gate
23 h 43 apart on the timetable, overnight
AA 3597 leaves 23 h 43 after UA 2838 arrives on the timetable: more than half a day, so not a connection we count.