AA 2303 then AA 2156 at Phoenix
St Louis → Phoenix → Newark
Timetable, Phoenix time
16:55AA 2303 from St Louis at the gate
23:02AA 2156 to Newark leaves the gate
6 h 07 apart on the timetable
The last days
AA 2303 and AA 2156 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.