If you wish to change the aircraft model in the order please be aware that you can only choose such a model that was in the production at the time you originally made that order. This is a game rule to prevent players from abusing the system by ordering lots of cheaper / worse models at the launch of new aircraft model when they know that a new and perhaps better model will be launched in the very near future, and then converting the orders to that model and gaining advantage in the production queue.
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