UA 3902 then AA 2774 at O'Hare
Rio De Janeiro → Chicago → New York LaGuardia
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
12:18AA 2774 to New York LaGuardia leaves the gate
19 h 17 apart on the timetable, overnight
AA 2774 leaves 19 h 17 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.