The google docs info I referred to in another thread was illuminating in how a heavy UK point of sale sort of negates the idea of an US carrier from flying here as those airlines go where Americans want to go.
This is for comparison - I can see a case for ATL increasing as it performs fare better for VS at MAN against Delta at EDI. 59000 passengers paying $1K fares for 25 cents for revenue per mile versus 52000 passengers paying $700 fares at 18 cents for revenue per mile. It's JFK and Orlando that truly dip the average MAN transatlantic revenue per mile down - with them included it's 1.13 million passengers at 14 cent a mile Without them, it's 520,000 passengers at 17 cents a mile VS just need convincing that instead of adding more JFK and MCO, it may be better them reintroducing BOS and LAX