The story
ITA's first product was an airfare search and pricing system called QPX. This system has been and is used by travel companies such as Bing Travel, CheapTickets, Kayak.com, and Orbitz, and by airlines such as Alitalia, American, ANA, Cape Air, Delta Air Lines, United Airlines, US Airways, and Virgin Atlantic. ITA also hosts its own airfare search website based on QPX, called "Matrix", although it is not possible to buy tickets from it.
ITA was known for using programming puzzles to attract and evaluate potential employees since 2001. Some of these puzzles have appeared in ads on Boston's MBTA subway system. ITA is also one of the highest-profile companies to base their software on Common Lisp.
In January 2006, ITA received $100 million in venture capital money from a syndicate of five investment firms led by Battery Ventures, marking the largest investment in a software firm in New England in five years.
In September 2006, ITA announced a several-million-dollar deal with Air Canada to develop a new computer reservations system to power its reservations, inventory control, seat availability, check-in, and airport operations.
In August 2009, Air Canada announced that the project had been suspended.
In July 2010, Google announced the acquisition of ITA for $700 million in cash, subject to DOJ review and approval. On April 8, 2011, the US Dept. of Justice and Google reached an agreement in terms to allow the purchase and dismiss a potential antitrust lawsuit.
On March 1, 2012, Google and Cape Air announced that Cape Air had migrated to ITA Software's passenger service system (PSS). One year later, Google announced that it was discontinuing the PSS.
In 2013, Google started offering a simplified API to QPX called QPX Express; it was discontinued on April 10, 2018.
From Wikipedia’s article on ITA Software, shared under CC BY-SA 4.0.4