Concerns over climate change are adding to the pressure for a modernized U.S. air traffic control system, TIME reports. Under threat of a carbon tax, the aviation industry wants pilots to fly the straightest routes possible, but current radars force inefficient zig-zagging. If the NextGen system is rolled out by 2018 as planned, airlines will use about 1 billion gallons less fuel, the FAA estimates. Until then, the outmoded air traffic system will continue to cause headaches for the industry. "We're sticking with cassette tapes when we should be moving to DVDs," says Marion Blakey, president and CEO of the Aerospace Industries Association.

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