WN 3872 then AA 640 at Denver
Salt Lake City → Denver → Charlotte
Timetable, Denver time
07:25WN 3872 from Salt Lake City at the gate
14:17AA 640 to Charlotte leaves the gate
6 h 52 apart on the timetable
The last days
WN 3872 and AA 640 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.