Thank you AJA. I have spent the last couple of hours trying to get my head around your reply which I’m sure is right, but I feel a little bit silly as I don’t quite understand. To my mind MIA to DUB is shorter than MIA to LHR unless the routing is calculated MIA to LHR to DUB. I would prefer not to do JFK if I can. Would FNC work? What is RSF mean - sorry newbie still learning?
Thank you.