I tried to park the original B747 that came with FSX on gate A6, which has the double jet ways, but again, only one of them works.
Nobody said that double jetways would work. JFK, as with all our other sceneries, uses the default FSX jetway system, which means we model a jetway, and
FSX controls it. FSX only supports ONE jetway, reaching to ONE door so, double jetway will never work under this sytem.
The A380 triple jetway case is an exception to this, more like a one-time only special case. But, again, nowhere we said that, on that triple jetway, that all 3 will work. When we said that an A380 can trigger the triple jetway, it only means that, if you have an A380 (any A380, provided it's an FSX airplane), the 1st will work because it's controlled by FSX, and the 3rd one (only) can be moved by the user. Nothing has ever been said about the 2nd one...
Is there a way to have this fix?
There's nothing to "fix", because it's obviously not a bug. Many sceneries out there don't even have ANY moving jetways, not even single, let alone double and triple...
I mean the whole reason I purchased this airport was because I wanted to be able to use double jet ways on a large aircraft.
Now, I think you are exaggerating it a little bit: you bought this scenery because it's JFK and you might have been interested in that airport, and I don't think there are better JFK sceneries out there.
But if having a double jetway was so important to you, up to the point of deciding to purchase or not based on that feature, you could have check it out how it worked first hand, by using the Trial version, which the only reason for it to exists, is to allow customers to check before purchasing, it the product satisfies they own expectations.
I do understand that works on your A380, but I am not planning on purchasing that model in particular, as I've read it's poor design.
We haven't made any A380, Wilco have one. We just *tested* it only with that model but, there are no reasons why it would work with another A380.
However, there might be a solution in your case, and it would be to buy AES credits for JFK. AES is a software from Aerosoft, that will allow to have, amongst several other things, more flexibility with jetways, since it use its own method to animate jetways, which is independent from FSX.