AA 894 then UA 3916 at O'Hare
Boston → Chicago → New Orleans
Timetable, Chicago time
14:18AA 894 from Boston at the gate
07:00UA 3916 to New Orleans leaves the gate
16 h 42 apart on the timetable, overnight
UA 3916 leaves 16 h 42 after AA 894 arrives on the timetable: more than half a day, so not a connection we count.