In response to FairSearch.org's claims, Andrew Silverman, Senior Product Manager at Google, writes the following on Google's Public Policy Blog:

Claim: The deal could result in higher travel prices or fewer travel choices for consumers.
Fact: ITA and Google are not competitors so there will not be less choice for consumers. In addition, ITA does not set ticket prices or sell tickets, but merely analyzes data about seat availability and fares -- which are set by airlines -- and provides that analysis to websites. So it