WN 801 then WN 657 at Denver
Boston → Denver → Detroit
Timetable, Denver time
07:30WN 801 from Boston at the gate
17:25WN 657 to Detroit leaves the gate
9 h 55 apart on the timetable
The last days
WN 801 and WN 657 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.