By Gary Stoller, USA TODAY
Starting next Thursday, airliners and other planes flying high over the Americas will pass much closer to one another than is now allowed - as close as 1,000 feet above or below.
With the change, which is being made mainly to save airlines billions in fuel costs, U.S. safety officials offer passengers some advice: Relax. The 1,000-foot standard has been in place elsewhere in the world for years without incident. In addition, safety equipment aboard planes has been upgraded
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