You realize the machines they use at the Airport security scans are X-ray machines and use high powered magnets. I ALWAYS take my laptop out and NEVER put it through an X-ray machine. That could mess up the hard drive or the Flash memory because it uses electromagnetics to store the data.
It's comments like this that make me shake my head in disappointment. Why do people continue to spread misinformation that they heard from someone who heard it from someone?
The post that an airport x-ray has ANY negative impact on a laptop or the data on it is utter bulls$#t... and in any event, the laptop goes through regardless of if it's in your bag, or in the conveyor bin, so I'm not sure what this guy's post is even trying to say. He doesn't skirt the x-ray with a laptop, so clearly he's either lying or just hasn't flown in 15 years, I'm guessing the latter.
Last night I went through security and left my MBA 11" in the bag. No issues with security. I asked the TSA screener, he said general rule is if it's less than 15" they'll let it go through when they see it, provided it doesn't obstruct any views inside the bag. Even a 13" MBP is fine, but he said once it gets to that size it makes it more difficult to see inside a bag, however the important thing to note here is for 11" owners like me he says the general policy is to leave them in the bag.