DL 280 then DL 849 at Seattle
Shanghai → Seattle → New York JFK
Timetable, Seattle time
12:00DL 280 from Shanghai at the gate
16:00DL 849 to New York JFK leaves the gate
4 h apart on the timetable
Today
From the airport’s board at 00:45 Seattle time
11:18DL 280 expected at the gate42 min early
16:00DL 849 due to leave, no estimate yet
4 h 42 between the gates, on these times
Seattle’s board gives a departure time for only about 57% of its flights, so many days show no gate time.
The last days
DL 280 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.