Freebbble!

From the author: “I set out to create a more convincing, yet scaleable and full vector hardware template of the MacBook Air, complete with the new MagSafe 2 connector.”

Vector MacBook Air Template is a free Mockup design resource made by Dribbble user Kris Mendoza. As far as I can tell, its license is Unknown.

Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.