While searching for cases/shells for MBA 11-inch(2013), I got really confused as to some cases have vent holes on the bottom. Some don't. Does it really matter? While it's not exactly the same, my iPad 64GB 3G has been inside the Otterbox Defender case since day one. During the last 2 years, it never had any problems. This morning, I finally took it out for the first time in 2 years. The iPad looked brand new. The Otterbox had protected it well even after several severe drops.(including one the fell from the overhead bin to the floor of a regional jet) I just wish Otterbox made a Defender case for the MBA... yeah... nobody except me is going buy it.