Identify your MacBook Air model – Apple Support (UK)
Amazon.com: SYNERLOGIC (M1+Intel) Mac OS Monterey/Big Sur/Catalina/Mojave Keyboard Shortcut Sticker - Black Vinyl, No-Residue Adhesive, for 13"-16" MacBook Air/Pro iMac Mac Mini : Electronics
Install and run macOS Catalina on High Sierra using VirtualBox
macOS Catalina on my 2011 17” Macbook Pro. 👍 : r/CatalinaPatcher
Is Catalina the most recent MacOS, and can it be run on a 2015 MacBook Air? - Quora
MacBook Air On macOS Catalina Is Too Slow - YouTube