AA 3236 then UA 3914 at O'Hare
Phoenix → Chicago → Houston
Timetable, Chicago time
05:00AA 3236 from Phoenix at the gate
20:30UA 3914 to Houston leaves the gate
15 h 30 apart on the timetable
UA 3914 leaves 15 h 30 after AA 3236 arrives on the timetable: more than half a day, so not a connection we count.