Originally Posted by chornedsnorkack
Then why arenīt the legacy airlines already spreading the load evenly between Heathrow, Gatwick, Stansted and Luton?
Another reason is that the established airlines are only selling London-New York tickets to a certain proportion of the passengers on their London-New York flights. Many of them are connecting to/from other flights from (say) Heathrow. Spreading the load might make some sense if all your passengers start from the UK, but it's an easy mistake for UK-based passengers to forget the high proportion of connecting passengers on board any flight.