AA 2654 then DL 1399 at Miami
Phoenix → Miami → Boston
Timetable, Miami time
05:00AA 2654 from Phoenix at the gate
11:37DL 1399 to Boston leaves the gate
6 h 37 apart on the timetable
The last days
AA 2654 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.