Cannot get the serial number of my MacBook Air

Log into https://appleid.apple.com/ with Apple ID and password. The laptop is listed and should show the Serial Number

I'm answering the question about the serial number. Grab a magnifying glass, it's on the bottom of your case right by the seam. At least it is on the new MacBook Air.

Turn the computer over and read the serial number from the bottom of the computer.

H! I was too slow. Someone else already answered the question.