DL 2513 then AA 3597 at O'Hare
New York LaGuardia → Chicago → Huntsville
Timetable, Chicago time
20:45DL 2513 from New York LaGuardia at the gate
19:51AA 3597 to Huntsville leaves the gate
23 h 06 apart on the timetable, overnight
AA 3597 leaves 23 h 06 after DL 2513 arrives on the timetable: more than half a day, so not a connection we count.