UA 2220 then AF 8 at Boston
Chicago O'Hare → Boston → New York JFK
Timetable, Boston time
15:36UA 2220 from Chicago O'Hare at the gate
20:15AF 8 to New York JFK leaves the gate
4 h 39 apart on the timetable
The last days
UA 2220 and AF 8 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.