AA 2446 then MQ 4126 at Miami
Boston → Miami → Jacksonville
Timetable, Miami time
14:39AA 2446 from Boston at the gate
18:35MQ 4126 to Jacksonville leaves the gate
3 h 56 apart on the timetable
The last days
AA 2446 and MQ 4126 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.