Is there viable competition anywhere to Google? Let's forget about the poor Microsoft shareholders and ask what the fact that Bing only exists due to massive subsidies says about the health of competition in search.
Google's acquisition of ITA should be blocked, as should all attempts at vertical integration by a search engine provider into comparison-based businesses or into any direct retailing-based businesses.
The discussion of Google and antitrust has shifted in recent weeks from relevant market and anticompetitive behavior to consumer happiness. The problem is that consumers are not always the best judges of their own welfare.