OS 7797 then UA 3547 at Newark
London → New York → Boston
Timetable, New York time
15:10OS 7797 from London at the gate
16:25UA 3547 to Boston leaves the gate
1 h 15 apart on the timetable
The last days
OS 7797 and UA 3547 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.