Hipmunk are a customer of ITA. See http://news.ycombinator.com/item?id=1912477 http://news.ycombinator.com/item?id=1912477 In the Google announcement, they say

Hipmunk are a customer of ITA. See http://news.ycombinator.com/item?id=1912477 http://news.ycombinator.com/item?id=1912477 In the Google announcement, they say that ITA’s existing contracts will be honored & have extended contracts through to 2016 This deal was announced a long time ago. Hipmunk will have already planned for this situation