DL 1909 then B6 318 at JFK
Salt Lake City → New York → Boston
Timetable, New York time
05:00DL 1909 from Salt Lake City at the gate
08:00B6 318 to Boston leaves the gate
3 h apart on the timetable
The last days
DL 1909 and B6 318 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.