AA 756 then DL 1399 at Miami
Norfolk → Miami → Boston
Timetable, Miami time
08:24AA 756 from Norfolk at the gate
11:37DL 1399 to Boston leaves the gate
3 h 13 apart on the timetable
The last days
AA 756 and DL 1399 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.