WN 4303 then KL 6537 at San Francisco
Denver → San Francisco → Atlanta
Timetable, San Francisco time
10:15WN 4303 from Denver at the gate
14:05KL 6537 to Atlanta leaves the gate
3 h 50 apart on the timetable
The last days
WN 4303 and KL 6537 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.