If you customized JFK before we added new jetways, you must remove your customization file for JFK here:
%APPDATA%\Virtuali\GSX
Because your customization file is taking precedence over the one that we updated to add jetways. Also, if you replaced/renamed the FSDT AFCAD with one with a different name, the whole customization won't be loaded, so you'll also won't see SODE jetways.
The parking customization page will tell you the name of the file used to customize the airport. If it's an FSDT airport, and you don't see the "Designer provided" indication, it means it's not using our customization, so you might have a problem.