UA 3915 then AA 523 at O'Hare
Miami → Chicago → Washington National
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
19:31AA 523 to Washington National leaves the gate
21 h 06 apart on the timetable, overnight
AA 523 leaves 21 h 06 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.