How to know my MacBook Air serial number if I don't have the power supply?

Mr. Bacon Said:

"Serial number: I've got a Macbook Air I want to trade in. I don't have the power supply and I need the serial number. Apple used to have a place to look at all your Apple products where you could get that info. Does anyone know where that info is?"

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Where to Obtain a Serial Number:

A. Original Packaging:

You'll find the Serial Number on the box that this device was packed in.

B. Purchase Invoice or Receipt:

You'll find the Serial Number printed on the invoice or receipt that cam with your device:

C. Use Your Account:

If associated to your App Account, click it:

1. Login: https://appleid.apple.com/
2. Click: on Devices
3. Click: Your MacBook Pro
4. View: the Serial Number

D. Check your Coverage:

Viewing your covered items, you'll find it here, by click on the item. Go Here:: Check Your Service and Support Coverage - Apple Support

Turn the computer over and read the serial number off the bottom.

NP. We see this question often. Good luck with your new computer.