Checking my pax log, the fastest (relative to point of dep and arr) oceanic westbound crossings I made over the past 40 years were FRA-JFK 7:51 (Lufthansa DC-10) and BRU-JFK 7:06 (Capitol DC-10). In contrast, my longest westbound from BRU to JFK was 8:36 also with Capitol but in a DC-8 (60 srs). However, as that particular flight was quite some time ago, I have no recollection if there was any holding or slowing right down over Boston involved).