UA 142 then WN 8539 at Denver
Tokyo → Denver → Austin
Timetable, Denver time
12:15UA 142 from Tokyo at the gate
12:18WN 8539 to Austin leaves the gate
3 min apart on the timetable
The last days
UA 142 and WN 8539 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.