It's pretty easy to install OSX on a laptop with the exact same specifications as the MacBook Air.
You have CLEARLY never gone the hackintosh route, have you? I have, a few times. And no matter if all the internal components are compatible, there are ALWAYS bugs popping out constantly: computer wouldnt wake up from hybernation, webcam without audio, volume stuck at max level, trackpad's multi-finger motions not working, etc.
If you wanna go OSX in any sort of reliable way, Apple is the only way.