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
Question marked as
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