That’s exactly what I think yes.
And I knew a sentence like Windows 11 is not yet supported would immediately appear here
simply ridiculous. Let me elaborate one last time in this forum before I stop wasting time on this game …
I have two gaming PCs with more than potent enough hardware for this game:
RTX 3080, Ryzen 5800X, Crosshair VIII Hero, 32 GB Ram
GTX 1080, Ryzen 3700X, Crosshair VII Hero, 16 GB Ram
Disclaimer: There is nothing overclocked in the PCs and the GPUs (especially the RTX 3080) are even downclocked not for stability but for lower temperatures and less noise. A ton of other resource hungry games (despite no game being completely bug free) run without CTD issues and also general PC stability is fine with not a single crash of Windows since I have these PCs.
I was running Windows 10 21H1 and Windows 21H2 in the period when I had the CTDs.
I am now running Windows 11 21H2 (production release no preview version!) and still have the same CTDs.
I am owning the premium deluxe version of the game on Steam. I have tried to stop the crashes by just installing the standard content. Didn’t help. I have no custom modifications installed.
I have tried with and without the “world updates” installed in both variants the vanilla standard install and the premium deluxe content install.
I have tried all planes from the standard version and the 787.
I was even installing a clean copy of Windows 10 21H2 and Windows 11 onto a separate SSD and only installed Steam and FS (and of course system drivers).
I have no accessories connected to my PC for testing except for a mouse and keyboard, oh and a display if you call that accessory 
Did I miss anything? Probably but I am sick of trying to find a solution to this broken game if it can’t even run on a clean install.
The CTD issues are reproducable with any plane in any of the above configurations and never happened while starting the game or in the menu, they ALWAYS happen 1-5 minutes after take off no matter if I fly with auto-pilot or manually (which admittedly is difficult on some planes with just mouse and keyboard). There is no error message except an access violation logged in the Windows logs (0x00…5).
Btw … when the game was out new everything was working fine in terms of no crashes happening (auto-pilot and planes were bugged but there were workarounds for that). The CTD issues started with world update V iirc but they are not related to the content since they happen when world update V isn’t installed as well (but standard content was “patched” to death at that time too).
Probably the last 100 hours of my Steam gameplay statistics were (re)downloading at 100 MBit and loading times of the game …