WN 1971 then DL 849 at Seattle
Las Vegas → Seattle → New York JFK
Timetable, Seattle time
11:45WN 1971 from Las Vegas at the gate
16:00DL 849 to New York JFK leaves the gate
4 h 15 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
WN 1971 and DL 849 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.