ITA is built on lisp. http://en.wikipedia.org/wiki/ITA_Software http://en.wikipedia.org/wiki/ITA_Software Orbitz, along with Kayak and many others, is an ITA

ITA is built on lisp. http://en.wikipedia.org/wiki/ITA_Software http://en.wikipedia.org/wiki/ITA_Software Orbitz, along with Kayak and many others, is an ITA customer.