WN 1553 then AA 4444 at Boston
Denver → Boston → New York JFK
Timetable, Boston time
16:55WN 1553 from Denver at the gate
17:30AA 4444 to New York JFK leaves the gate
35 min apart on the timetable
The last days
WN 1553 and AA 4444 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.