AA 2446 then DL 368 at Miami
Boston → Miami → Seattle
Timetable, Miami time
14:39AA 2446 from Boston at the gate
18:15DL 368 to Seattle leaves the gate
3 h 36 apart on the timetable
The last days
AA 2446 and DL 368 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.