I took a macbook black around Eastern Europe last year, and it was invaluable, however - it was quite a weight to lug around. I assume the Air is a lot lighter

I took a macbook black around Eastern Europe last year, and it was invaluable, however - it was quite a weight to lug around. I assume the Air is a lot lighter? If it saved me a kilo I'd seriously consider it. Battery life is important too.