[haspok]

You want an XPS 13 then.

I just used mine on a Ryanair flight a few days ago, cramped in the middle seat for 3 hours. The XPS 13 fit perfectly on the very small folding table, the top of the screen just sticking under the bottom of the pocket-thing that is always full of useless flyers.

I believe it has the same footprint as a MBA 11. And of course, I'm running Linux on it :)

[mmrezaie]

XPS 13 is amazing and with Linux support it is fine, but that keyboard though. You need to test it to see if it fits for you.