I have a 2011 Air. I formatted it, expecting to do the typical command-R re-installation. Whoops! It'll take the App store like 9 years to install Lion, then it just fails. So I thought to download a copy of Lion and make a bootable. But I can't find a copy with with the "installESD" file necessary to create the bootable version. Even using a DVD external and snow leopard doesn't work. Any help? I worked on this for hours before posting here. Thanks!