UA 3908 then AA 3544 at O'Hare
Fort Myers → Chicago → Detroit
Timetable, Chicago time
14:19UA 3908 from Fort Myers at the gate
13:30AA 3544 to Detroit leaves the gate
23 h 11 apart on the timetable, overnight
AA 3544 leaves 23 h 11 after UA 3908 arrives on the timetable: more than half a day, so not a connection we count.