The MacBook Air is encased in anodized aluminum, weighing only 3.0 pounds which maks it the lightest computer on the market at this time. I say at this time, because I’m sure it won’t be long before the new MacBook Air will get in our greedy consumers hands. Rumor has it that Apple will replace all aluminum with carbon fiber parts. And we’ve seen lately that most of Apple related rumors turn to reality.

Carbon fiber is an extremely lightweight material, being at the same time exceptionally strong.
Only by just replacing the lower case, the new Macbook Air could weigh 2.78 pounds or lower.
Well again we’ll just have to wait and see.

via macrumors