AA 6486 then UA 455 at O'Hare
Detroit → Chicago → Phoenix
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
12:55UA 455 to Phoenix leaves the gate
19 h 26 apart on the timetable, overnight
UA 455 leaves 19 h 26 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.