Does Macbook Air 2020 serial number starts with F?

Mine doesn't. You can always type the serial number into Apple's serial number lookup or everymac's

Check Your Service and Support Coverage - Apple Support

https://everymac.com/ultimate-mac-lookup/

Using my previous posting.

Verify the Serial Number from About this Mac matches the serial number appearing on the Original Apple Sealed White Box >> S/N

They should Match Exactly.

If not, the machine has been repackaged.

The serial number appears in microscopic print on the bottom of the device near the hinge. You will need a bright light source, perhaps magnification, and exceptional vision to see the s/n.

You should not make any assumptions about Apple's serial numbering scheme as it changed after the 2019 model year.

VikingOSX wrote:

You should not make any assumptions about Apple's serial numbering scheme as it changed after the 2019 model year.

I missed that.

edit: I found a few links that do say Apple started changing the format in 2021.

I go not know.

What does is say in Use About this Mac from the Apple Icon on Desktop ? .

My M2 MBA starts with the the letter W

Image above is a M1 Mac Mini

FWIW, a MacBook Air 2020's serial number could begin with F. The first three characters represent where it was manufactured.