You don't have just double jetways, you also have default buildings, those terminals are not coming from our airport.
As explained in many other threads in this forum, whenever you have "double something", it's never a problem of our scenery, it's always a problem created by *another* product in conflict, the most common causes are AFCADs coming from other products like AI Traffic packages, but they can also be remnant of other sceneries for the same area that haven't removed.
To find AFCAD duplicates in FS9, use the free ScanAFD program available at the major flight sim download sites, if you find any duplicates, remove all the extra.
Searching for generic non-AFCAD .bgl, instead, has to be done manually.