Yes, load factors don’t tell the whole story but the latest CAA stats for May show 5489 pax travelled between STN and JFK. That is a big increase on April, and shows a continuing upward trend. Overall LF for the route between the two is 64.7%.
Washington isn’t looking so promising though at present, just 42 pax per flight, but again that is an increase on April which was pretty poor. Perhaps the extra weekly flight starting this month will benefit them.