AA 111 then UA 3904 at O'Hare
Rome → Chicago → Houston
Timetable, Chicago time
14:10AA 111 from Rome at the gate
18:00UA 3904 to Houston leaves the gate
3 h 50 apart on the timetable
The last days
AA 111 and UA 3904 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.