Currently Being ModeratedNov 22, 2012 8:35 AM (in response to SecheltBurley)
"MacBook Air 4,x and later can't run Snow Leopard, while 3,x and earlier with at least 1 GB of RAM can run Snow Leopard."
(extract from a. brody's article https://discussions.apple.com/docs/DOC-2455 )
early 2011 MBA is MacBookAir4.1 or 4.2 (depending on screen size, so you're out of luck there.
Currently Being ModeratedNov 22, 2012 8:36 AM (in response to SecheltBurley)
If you have a Mac OS X thumbdrive specific to that Mac model, connect it, restart from the thumbdrive, erase the internal drive, and install an OS. If not, use another Mac to install Mac OS X 10.6.8 onto an external drive, either from a DVD or by cloning the MacBook's system, move that drive to the MacBook Air, and try starting that computer from it. If doing so only yields three beeps, no.