UA 2844 then AA 3484 at O'Hare
New Orleans → Chicago → St Louis
Timetable, Chicago time
09:35UA 2844 from New Orleans at the gate
09:30AA 3484 to St Louis leaves the gate
23 h 55 apart on the timetable, overnight
AA 3484 leaves 23 h 55 after UA 2844 arrives on the timetable: more than half a day, so not a connection we count.