UA 3915 then AA 489 at O'Hare
Miami → Chicago → Washington National
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
17:49AA 489 to Washington National leaves the gate
19 h 24 apart on the timetable, overnight
AA 489 leaves 19 h 24 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.