UA 4366 then AA 4478 at Dulles
Norfolk → Washington → New York LaGuardia
Timetable, Washington time
11:37UA 4366 from Norfolk at the gate
16:15AA 4478 to New York LaGuardia leaves the gate
4 h 38 apart on the timetable
The last days
UA 4366 and AA 4478 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.