Google, the world's No. 1 Internet search engine, said last July that it would buy ITA Software for $700 million in cash. The news sparked concern in the tech world that travel websites such as Kayak and TripAdvisor would be deprived of ITA's software.

One condition of Justice Department approval would touch on licensing of ITA products to Google rivals, said the source, who spoke privately to protect relationships with antitrust enforcers.

The two sides are still dickering over a condition that would touch on how Google treats potential competitors in search results, the source said.

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Read also "Google poised to become a giant in online travel" at Associated Press