AA 1673 then UA 4012 at Detroit
Phoenix → Detroit → Houston
Timetable, Detroit time
16:55AA 1673 from Phoenix at the gate
16:45UA 4012 to Houston leaves the gate
23 h 50 apart on the timetable, overnight
UA 4012 leaves 23 h 50 after AA 1673 arrives on the timetable: more than half a day, so not a connection we count.