There's no need for a GSX customization for FSDT KLAX, since we updated it ourselves with all SODE jetways a few days after GSX Level 2 was released.
As explained in the Los Angeles support forum, after running the FSDT Live Update, you MUST remove any previous configuration for KLAX you might have made, otherwise your .INI file will take precedence over the one we provide in the scenery, so you might not see the new jetways.
Same for KJFK. FSDT KJFK, of course...