AA 2315 then AA 1614 at Phoenix
Boston → Phoenix → Chicago O'Hare
Timetable, Phoenix time
09:22AA 2315 from Boston at the gate
17:18AA 1614 to Chicago O'Hare leaves the gate
7 h 56 apart on the timetable
The last days
AA 2315 and AA 1614 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.