AI traffic add-ons with real-world liveries have become increasingly popular with add-ons such as FSLTL, and airports have become filled with real-world liveries. However, because there currently exists no native tool to assign parking codes, you will often see airlines’ aircraft strewn randomly about the airport, including being parked at terminals and gates those airlines do not park at in real life.
There are ways to get around this - such as editing the airport’s XML files but it is not commonly done from what I have seen.
My proposal is to implement a tool in the scenery editor with the ability to assign parking codes to gates to allow proper airline assignments. This should hopefully encourage developers to include parking codes more often and make airports filled with real-world traffic much more immersive and true to life.