UA 3501 then AA 1632 at O'Hare
Detroit → Chicago → Tucson
Timetable, Chicago time
06:57UA 3501 from Detroit at the gate
20:56AA 1632 to Tucson leaves the gate
13 h 59 apart on the timetable
AA 1632 leaves 13 h 59 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.