how do I register my MacBookAir and service
How do I register my MacBook Air and service agreement
How do I register my MacBook Air and service agreement
You can register AppleCare at https://www.apple.com/support/applecare/register/
If you want (completely optional) you can also add your MacBook Air to your support profile: https://supportprofile.apple.com
As noted here, registration is not required: http://register.apple.com/html/Apple-ProductRegistration.html
You can check your warranty status at https://selfsolve.apple.com/agreementWarrantyDynamic.do
how do I register my MacBookAir and service