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My Air is also not officially supported but there is a whole community behind it to make it work
https://forums.macrumors.com/threads/macos-11-big-sur-on-unsupported-macs-thread.2242172/
https://forums.macrumors.com/threads/macos-12-monterey-on-unsupported-macs-thread.2299557/
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My Air is also not officially supported but there is a whole community behind it to make it work
https://forums.macrumors.com/threads/macos-11-big-sur-on-unsupported-macs-thread.2242172/
https://forums.macrumors.com/threads/macos-12-monterey-on-unsupported-macs-thread.2299557/..oh wow, wasn't aware of these efforts.
Does it make sense though (does your old Air run the new OS well)?
..unfotunately not.
Everything from Mojave (10.14) on will not work on his early 2011 MBP.
https://en.wikipedia.org/wiki/MacOS_Mojave#System_requirements