I've been using an X1 Carbon as my primary machine for the past ten months, and have been very happy with it. Has the typical Thinkpad construction quality, and is amazingly light - can't imagine carrying around my old T60 any longer. Ubuntu LTS installs and runs great, pretty much everything worked as expected out of the box. My only complaint is that the USB docking station, which supports multiple external displays and means fewer cables to plug/unplug, doesn't work with Linux (or at least didn't the last time I tried).
I run linux on my MBA 11". It works great. I don't think I get quite the battery life I'd get with OSX but apart from that everything works out of the box. Ubuntu has a Mac iso especially for Apple machines.
I'd recommend the dell XPS 13 developer edition (it comes with ubuntu). I'm not sure about the battery, but the form factor is pretty close to the MBA.
The Samsung Ativ Book 9 Plus might be what you want -- 13", 3200x1800, 3.2lbs, Haswell. (Haswell's the latest Intel chipset with excellent battery life.)
Seems to me that most alternatives have far shorter battery times than the MBA, even those that cost more. Could somebody who uses Linux (Ubuntu pref) post their actual battery times? I haven't found any notebook that will run for more than 3 hours that is lighter than the MBA.
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[ 5.1 ms ] story [ 45.1 ms ] threadI'm not entirely sure about the MacBook Air, but you can try looking into the Dell XPS series.
http://www.cnet.com/laptops/samsung-ativ-book-9/4505-3121_7-...