AA 4616 then UA 4749 at Detroit
Washington National → Detroit → Chicago O'Hare
Timetable, Detroit time
12:40AA 4616 from Washington National at the gate
16:32UA 4749 to Chicago O'Hare leaves the gate
3 h 52 apart on the timetable
The last days
AA 4616 and UA 4749 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.