WN 3529 then DL 45 at Boston
St Louis → Boston → New York JFK
Timetable, Boston time
13:45WN 3529 from St Louis at the gate
18:30DL 45 to New York JFK leaves the gate
4 h 45 apart on the timetable
The last days
WN 3529 and DL 45 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.