How to extend MacBook Air warranty which has currently expired?

..sumit6508:

Where there are some aspects of AppleCare, & AppleCare+ coverage

of which well defined duration and expiry timeline; some could allow

renewal months after. ~ Or might have been eclipsed by later inform-

ation from Apple; and where legal warranties could vary by region.

• Check Your Service and Support Coverage - Apple Support

//checkcoverage.apple.com/

"Check your Apple warranty status. Enter a serial number to

review your eligibility for support, and extended coverage."

"Or go to mysupport.apple.com and sign in with your Apple ID.

Then choose your device from the list." ~ could show more info.

An initial extended warranty, or "AppleCare+" if to be paid monthly,

had regional differences; in renewal times and varied duration.

• Extend your AppleCare+ coverage - Apple Support*

//support.apple.com/en-us/HT210580

"*Purchase the new coverage within 30 days after your original coverage ends.

To find out if you can purchase the new coverage, go to mysupport.apple.com 

and follow the onscreen instructions. The new coverage automatically renews

until canceled.Your plan coverage may continue beyond 24 or 36 months, on

a monthly or annual basis, until canceled." ~ See how these details may vary?

AppleCare+ Terms and Conditions.

Best to purchase 'extended' warranty. In US that adds additional year, plus

support/service, past the one year plan. (This extends all aspects then, to

the two year level.) Or get AppleCare+.

However if you reside in different legal jurisdiction, say in EU or UK;

the basic warranty would be in effect, an extended warranty. Due to

legal consumer rights there, and other regional (EU, UK, etc) details.

• Legal - Hardware Warranties - Apple

//www.apple.com/legal/warranty/

• Apple Products and Consumer Law Rights:

https://images.apple.com/legal/warranty/statutoryrights.html

• Product Service and Repair Information - Official Apple Support

[An accidental damage, outside of regular warranty, may be covered

by homeowner policies; or auto policy personal article 'floater' & etc.]

Since you didn't purchase AppleCare+ with your Mac there is no way to extend the warranty.

If the warranty is already expired, it’s way too late.