AA 6486 then UA 2050 at O'Hare
Detroit → Chicago → Denver
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
13:00UA 2050 to Denver leaves the gate
19 h 31 apart on the timetable, overnight
UA 2050 leaves 19 h 31 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.