This has been discussed many times already and, of course, it's not a scenery problem, it's just a problem you are using TOO MUCH STUFF in that area. There isn't a single cause for OOM, it's always a combination of factors, and the New York area is already very demanding, even without *any* addon, let alone with so many.
And no, it's not that you are having this problem "with this airport only", because not every airport is in the same area, unless you have multiple JFK version to compare, which you obviously haven't.
Of all addons you listed, JFK is the LESS demanding, so it's not surely the cause of the OOM.
Your 16GB of RAM are not really helpful, since FSX, being a 32 bit app, will never use more than 4GB anyway so, chances for an OOM are exactly the same as with a system with, let's say, half of that RAM amount. The VRAM doens't count, because that OOM message refers to standard RAM only.
I'm fairly sure that you will probably fix your OOM by removing any of the addons you have, because as I've said, none is the culprit, it's the combination of them which is just too much, and doesn't fit into the 4GB that FSX can allocate at maximum.