Long haul #1 is for sure NYC. I believe the 2nd is YUL
and I'm pretty sure that 3rd and 4th are PTP
and FDF (not sure of the order for those 2).
For short/medium haul non-domestic, the top 6 is certainly around LON, FCO
but I don't know in which order. But for the city pairs, you have to be careful if you consider a specific airport (LHR
) or all airports serving a city (e.g. LON). This can change a lot the classification.