do i have to register my new macbook air

Find information about your warranty or AppleCare plan - Apple Support

Check Your Service and Support Coverage by clicking here --> https://checkcoverage.apple.com/

Click on this link to read how to 'Update your proof of purchase' --> https://support.apple.com/HT202703

To update your information contact Apple Support by phone. Tell the advisor that you need help with your Apple Limited Warranty or AppleCare plan expiration date.

Here’s what you need when you call:

- Your AppleCare agreement number (if you have one)

- The device serial number

- Your sales receipt