UA 3911 then AA 868 at O'Hare
Portland (Oregon) → Chicago → New York LaGuardia
Timetable, Chicago time
17:09UA 3911 from Portland (Oregon) at the gate
08:00AA 868 to New York LaGuardia leaves the gate
14 h 51 apart on the timetable, overnight
AA 868 leaves 14 h 51 after UA 3911 arrives on the timetable: more than half a day, so not a connection we count.