I'd say, for the same reasons you chose a MBA, that a Chromebook would also work. One could use online editors and web frontends, or rip out all the Google-ness and pop in a standard *NIX distro. At that point, you're left with a cheap, lightweight alternative to an MBA. It's worked for me.
I had a Chromebook, it's more a toy... you cant run stuff locally and I work on a Train a lot...
Chromebooks weren't designed to run things locally, but they can after a bit of "coercing." This of course means removing ChromeOS, which means different things to different people.
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