AA 1610 then WN 1923 at Denver
Charlotte → Denver → Philadelphia
Timetable, Denver time
09:21AA 1610 from Charlotte at the gate
13:30WN 1923 to Philadelphia leaves the gate
4 h 09 apart on the timetable
The last days
AA 1610 and WN 1923 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.