If DY are to operate LGW US routes eg NYC, their approach at LGW to date makes sense. The development of sun routes eg AGP etc provide a good route to increased utilisation outside of say a daily transatlantic crossing. Similar to what EI do at DUB, 330 arrives from JFK and them goes down to AGP and back before the next trip west across the pond.
This could make the long haul flying program more cost effective and potentially reduce seat costs. Best of luck to them.
The arguement is well articulated about airlines preferring LHR over LGW on US routes . However, with restricted slot levels one of the US carriers may like to move say 1 daily service and free up a slot for a new US route that would develop more profitably at LHR eg Salt Lake City while at the same time offering a greater number of London Gateways on NYC route...