Hello there! I understand the pack is quite old and you may not feel like adding on to it anymore, but if you were still taking any suggestions: airplanes and airports =). I'm on the search of a pack for a game jam right now that includes this. Sadly this one can't be it due to this. Regardless wanted to leave the suggestion behind and compliments for what looks like great art. Very nice of you to post it here.
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Hi! That is such great feedback. It is now a Legacy Pack and honestly was not thinking about any more updates, but your feedback is very much appreciated and might start working on one last update to include your suggestion. I am working on another one of my packs to include pretty much what this one has, including damaged and destroyed buildings, vehicles, etc. And will definitely be adding an airport asset pack to that one.
That sounds great and a good 'universal' pack! I might just bookmark it for a future project. If it comes to good use, I'll surely be willing to pay for it, too.
A side note, I don't know if you already are, but also look into publishing these packs on for example the Unity asset store. I personally tend to look there first as a Unity-focused developer. But there, you'd best be off putting a price tag on it if you want to get anything from it.
Have a nice day!