Right. ITA's flight search tool was best-of-class in its time (and still is). Their competition at the time were Amadeus and Sabre which were written in assembl

Right. ITA's flight search tool was best-of-class in its time (and still is). Their competition at the time were Amadeus and Sabre which were written in assembly and ran on old-school mainframes. ITA's founders were MIT AI Lab alum so they wrote the first version of their software in Lisp. [1] ITA's code now powers Google Flights. [1] http://www.paulgraham.com/carl.html http://www.paulgraham.com/carl.html