Originally from WSJ, excerpts here from post-gazette.com:

Google Inc.’s two billionaire founders, both 32 years old, will soon be cruising the skies in a Boeing 767 wide-body airliner. They bought the used plane earlier this year, Mr. Page says.

Mr. Page acknowledges that the purchase might seem ostentatious. But “we tend to have an engineering approach, to be fact-based,” he says. “We looked at this and we just did the economics and we said, ‘you know, it makes a lot of sense.’ “

Aviation-industry experts estimate that the airplane, because of its age and history, cost under $15 million, and maybe less. That’s roughly one-third the price of a new Gulfstream 550 business jet. In addition, the 767 can carry more passengers and can include sleeping accommodations. The Google co-founders wanted to fit more than 50 people but were limited by federal aviation rules, Mr. Page says. Filled to capacity, it’s potentially cheaper to run, per person than a Gulfstream.