This feature is to make IF more realistic and fun. In this feature, it would allow the player to set AI traffic at 2 airports (arrival and departure) so it would be less lonely and more realistic than flying into LAX with nobody there. This is only for single player though as it would make the online servers slower and it would just be a nightmare. These planes could taxi around, sit at gates or even take off and land. This would also be one of the few features that are only for single player which would make it more popular. Disclaimer for anyone who really wants this: This will take a long time to be implemented into the game if it ever is.
I like this idea, you got my vote
I like this idea, especially since I fly on solo a lot. However it would be quite hard to implement.
Also you already made a thread for this Here.