coonect a1407 to macbook air in

I think you will need to use a USB-C to Thunderbolt Adapter:

https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter

Hi there Jackstrom1,

We understand you have questions about connecting a Thunderbolt Display, to a USB-C equipped MacBook Air. The following page offers information we think will help, and mentions the Apple Thunderbolt Display specifically: About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter

We hope this helps!