Fact that KLAX has AES support in the first place, is just a lucky coincidence that we have to model and separate jetways and terminals anyway, to get jetways in FSX so, as long as we use the standard FSX system, which only allows for a single jetway per gate, we'll not do additional modeling work just to add a feature that will be used only by AES. This might change in the future, if we'll replace the FSX jetway animation system with our own.
The KLAX FS9 version, being a direct port from FSX, inherits all its features and design/modeling too.
