They supplied us with arrival data for the largest U.S.-based airlines for the last three holiday seasons, which we define as Nov. 20-Dec. 1 for Thanksgiving and Dec. 20-Jan. 6 for the winter holiday. (We examined only arrivals because departure delays can often be offset once a plane is airborne.) The U.S. Department of Transportation also tracks flight information for the holiday season, but FlightStats' list of airlines is more comprehensive.

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Meanwhile, Downing Street has revealed the carbon dioxide emissions from the prime minister's plane will be "offset" by making an investment in "energy-saving technology" in the developing world.

BBC: NEWS | UK | UK Politics | Blair demands green 'revolution'