UA 3902 then AA 2279 at O'Hare
Rio De Janeiro → Chicago → San Juan
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:05AA 2279 to San Juan leaves the gate
15 h 04 apart on the timetable, overnight
AA 2279 leaves 15 h 04 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.