AA 3671 then AA 2778 at Phoenix
Grand Junction → Phoenix → Boston
Timetable, Phoenix time
07:49AA 3671 from Grand Junction at the gate
13:43AA 2778 to Boston leaves the gate
5 h 54 apart on the timetable
The last days
AA 3671 and AA 2778 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.