Interesting discussion re LGW US services.
The fact is that LHR is more attractive for a whole host of reasons means that when the airlines get the opportunity to move over they do. But compounded to this is the fact that in many cases it is a foreign carrier who moves and usually will not operate the same route to 2 London airports eg Vietnam Airlines. Hence, LHR becomes the one.
I disagree that LGW USA routes were unprofitable, but the shortage of routes , and a big reduction in airlines mean that it's much harder than before to get airlines into routes. And given the scale of LHR ops to the US any other London airport is a hard sell. Let's see how DY get on, but the fact here is that their point of difference has to be on price and nobody thus fas has sustainable cracked low cost long haul ..