Hi, suggestions for airports to be added are supposed to be posted in World of Airports > Airport Suggestions following the template that is generated there. You can vote for those that have already been suggested (such as KLIA) and make posts for the others.
Similarly, airlines and liveries should also be suggested in their respective categories, but AirAsia, which you mention, is already in the game (incl. AirAsia X, Thai AirAsia and Thai AirAsia X).
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