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I'm not with Laminar Research, just a fellow simmer in the UK, but in my experience, the grey question mark that appears with some aircraft in the X-Plane 11 flight configuration page, usually happens when .png (thumbs) showing the whole aircraft and livery, are not present in the main aircraft folder.
I have a couple of such examples after downloading liveries from LR's website, where these .png thumb files are missing.
Please see photos below, one showing the grey question mark and the other showing where the .png thumb files should be located.
In my experience again, if these .png thumb files are where they are supposed to be, then I never get the grey question mark!
PS Sometimes I can actually find the relevant .png whole aircraft thumbs in the Objects sub folder, but sometimes they are simply missing altogether?
When you open X-Plane 11 and go to the aircraft selection page, you will be presented with images of various aircraft to choose from, in a particular livery.
If you've not selected a given aircraft before, then normally the image will in be the LR default livery. If you have used a given aircraft before, then the next time you select that same aircraft, it will be in the same livery as when used previously, if that makes sense?
Anyway, if I understand your question correctly i.e. how do you change from the default livery to something different, then please see the photos that I have prepared below for guidance.
Hopefully this helps, but please let me know if not?
HiYou can download the latest 3.34 full version of Zibo's 737-800X from the Google Drive website @ https://drive.google.com/drive/folders/0B-tdl3VvPeOOYm12Wm80V04wdDQJust right click the file and select download, but be warned, the file size is a whopping 2GB!Also, you may need to have an account with Google/Gmail to download this file, I'm not 100% sure if you can download without this?Hope this helpsRegards
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