AA 457 then UA 3916 at O'Hare
Washington National → Chicago → New Orleans
Timetable, Chicago time
14:15AA 457 from Washington National at the gate
07:00UA 3916 to New Orleans leaves the gate
16 h 45 apart on the timetable, overnight
UA 3916 leaves 16 h 45 after AA 457 arrives on the timetable: more than half a day, so not a connection we count.