The aircraft configuration file doesn't have anything to do with the parking configuration. But of course, what vehicles you'll see in the editor, are dependent by the aircraft loaded when you enter in the editor.
And rightly so because, even if you might want to disable a specific service for an airplane, doesn't mean the parking shouldn't accept it for *another* airplane, so it allows you to customize its position, even if the airplane you had loaded when you entered the editor has the service disabled, so you will only see the pointer icon but no vehicle.
Of course, when customizing a parking, it's best if you do it while sitting in an airplane that has all the services and doors enabled, so you can see the actual vehicles, which is easier than placing just with the pointer.