SAN FRANCISCO (AP) - Google Inc. plans to buy travel technology company ITA Software Inc. in a $700 million deal that would enable the Internet search leader to steer more of the airline reservations booked on the Web.

The all-cash deal announced Thursday signals Google's intention to challenge flight-comparison services that are ITA customers, including Kayak, FareCompare, Hotwire and Microsoft Corp.'s Bing Travel. The deal is likely to face tough federal scrutiny.

ITA Software, a 500-employee company created in 1996 by computer scientists at the Massachusetts Institute of Technology, sells technology that helps run the reservation systems of many airlines.