UA 8247 then B6 616 at San Francisco
Tampa → San Francisco → New York JFK
Timetable, San Francisco time
19:10UA 8247 from Tampa at the gate
22:56B6 616 to New York JFK leaves the gatealso EY 8046, EY 8242, EY 8246, JU 8513
3 h 46 apart on the timetable
The last days
UA 8247 and B6 616 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.