Upgrade OS Compatibility For Early 2014 MacBook Air
Can I upgrade to OS X 12.0 from High Sierra 10.13.6 on my MacBook Air - Early 2014
MacBook Air Apple Silicon
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Sorry, no. An early 2014 MacBook Air can be upgraded to the latest version of Big Sur macOS 11 but no later.
See the following from Identify your MacBook Air model - Apple Support
MacBook Air (13-inch, Early 2014)
Model Identifier: MacBookAir6,2
Part Numbers: MD760xx/B, MD761xx/B
Newest compatible operating system: macOS Big Sur
Tech Specs: MacBook Air (13-inch, Early 2014)
User Guide: MacBook Air (13-inch, Early 2014)
MacBook Air (11-inch, Early 2014)
Model Identifier: MacBookAir6,1
Part Numbers: MD711xx/B, MD712xx/B
Newest compatible operating system: macOS Big Sur
To upgrade, see: How to download macOS - Apple Support