Apple MacBook Air (11-inch, Mid 2011) - Manual (Page 52)

52 Chapter 3 Problem, Meet Solution
Locating Your Product Serial Number
Use one of these methods to find your MacBook Air serial number:
 Turn over your MacBook Air. The serial number is etched into the case near the hinge.
Serial number
 Choose Apple () > About This Mac. Click the version number beneath the words
“Mac OS X” to cycle through the Mac OS X version number, the build version, and the
serial number.
 Open System Information (in the Utilities folder in Launchpad). In the Contents pane,
click Hardware.