AA 2701 then AA 4801 at Boston
Phoenix → Boston → St Louis
Timetable, Boston time
05:38AA 2701 from Phoenix at the gate
10:15AA 4801 to St Louis leaves the gate
4 h 37 apart on the timetable
Boston’s board gives an arrival time for only about 59% of its flights, so many days show no gate time.
The last days
AA 2701 and AA 4801 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.