What is the latest macOS for my MacBook Air 13

Perhaps to better identify your MacBook Air 13-inch model, refer to this article.

• Identify your MacBook Air model - Apple Support

https://support.apple.com/en-us/HT201862

You may be urged to upgrade (or forced to try them) due to newly reconfigured

Apple upgrade server links; should you look for Big Sur ~ their page may go to:

• How to upgrade to macOS Monterey - Apple Support

https://support.apple.com/en-us/HT212735

Older systems 'downloadable-installers' are out there; some no doubt, in hiding.

• How to get old versions of macOS - Apple Support

https://support.apple.com/en-us/HT211683

..To confirm compatibility before downloading, 

check the minimum hardware requirements..

Good luck & happy computing!🌞