I would actually suggest a third alternative, the Macbook Pro 13". I have had all three laptops: 1. Macbook 15": Awesome specs, but it is pretty heavy and is n

I would actually suggest a third alternative, the Macbook Pro 13". I have had all three laptops: 1. Macbook 15": Awesome specs, but it is pretty heavy and is not the most convenient if you want to code on the plane. 2. Macbook 13": Middling specs with a DVD drive. It is almost as small and almost as light as the Air. 3. Macbook Air: It is extremely light but I find the fact that I can't upgrade the RAM annoying. The battery life is pretty good but my main gripe against the Air is the fact that the keyboard is subtly more cramped as compared to the Pros. (This becomes an issue when you press the power button instead of the delete).