Attendees walking past the Sony PlayStation booth at the Game Developers Conference in San Francisco in 2012. The PlayStation and Microsoft's Xbox consoles were experiencing a possible hack on their online sites.
A New York Stock Exchange trader works on the floor on Dec. 17. Stocks rose nearly 300 points after the Federal Reserve announced it plans to begin raising interest rates next year.
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Fuel prices have plummeted this year, but airfares have remained high. The International Air Transport Association estimates that the world's airlines will rake in nearly $20 billion in profits this year.