TL;DR : Set your browser User Agent to this:
Mozilla/5.0 (X11; CrOS i686 1193.117.0) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.66 Safari/535.7
(via Hack to get free WiFi on Virgin America flights exploiting Chrome Book promo (Save $12.95) | ComicMac)
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