UA 3915 then AA 4613 at O'Hare
Miami → Chicago → Memphis
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
22:03AA 4613 to Memphis leaves the gate
23 h 38 apart on the timetable, overnight
AA 4613 leaves 23 h 38 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.