I have the July 2011 MacBook Air. It is the fastest machine I have ever used…by a long shot. But the 256GB drive is small for my wants (not needs), and lately I find myself regularly deleting content I would prefer to have available. When the price is right, I’ll upgrade to a larger SSD and this article from Arstechnica is my first reference on the how-to.
From Arstechnica.com…
Apple launched updated MacBook Air models in October of 2010, featuring new, compact, and (originally) proprietary form-factor solid state drives (SSDs). The SSDs have so far only been available to OEMs directly from Toshiba, despite the fact that the SSD is the only user-replaceable part in the MacBook Air. It took a few months, but long-time Mac upgrade source Other World Computing stepped up to offer three upgrade options based on fast Sandforce controllers.
via How-to: replace your MacBook Air SSD with OWC’s Aura Pro Express.