AA 5660 then UA 302 at Detroit
Washington National → Detroit → Denver
Timetable, Detroit time
09:01AA 5660 from Washington National at the gate
08:50UA 302 to Denver leaves the gate
23 h 49 apart on the timetable, overnight
UA 302 leaves 23 h 49 after AA 5660 arrives on the timetable: more than half a day, so not a connection we count.