A teardown of the brand-new 2015 13-inch MacBook Air by iFixit has revealed a surprising difference between the 11-inch and 13-inch models -- the latter has also inherited the double-speed new PCIe flash storage system that is included in the new MacBook, which Apple says is up to two times faster than even the recent generation of PCIe flash storage seen in recent MacBook Air models, and in the refreshed 11-inch model. Preliminary testing has confirmed the claim.