As you'll recall the TSA (Transportation Security Administration) was hard at work, hoping to avoid making another MacBook Air owner miss their flight (the security people didn't know what to make of the x-ray images of the MacBook Air). The TSA got their hands on a MacBook Air for some testing, and ran it through one of their test x-rays machines. Lo and behold, the solid state drive made the MacBook Air look different than traditional notebooks (though in what way, the TSA can't say).
The long and the short of it is that the TSA is distributing printouts of the MacBook Air's x-ray to screeners across the country so they know what to look for. I feel more secure already.