I wonder if this based on Google's acquisition a while back of ITA Software (
http://www.itasoftware.com/)... if I remember correctly, this caused some excitement in the Common Lisp world, since their QPX software was written in it, and it would represent the first big app inside Google to use CL (also the acquisition also brought some big names in the field to Google). The ITA software already is used in some of the other big flight-comparison sites (Kayak, Orbitz, and some others).