AA 3236 then UA 5205 at O'Hare
Phoenix → Chicago → Houston
Timetable, Chicago time
05:00AA 3236 from Phoenix at the gate
09:00UA 5205 to Houston leaves the gate
4 h apart on the timetable
The last days
AA 3236 and UA 5205 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.