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Hard-hit airlines stepped up efforts to show regulators that flying is safe. KLM and Air France said several jetliners that they flew as high as 41,000 feet showed no ill effects from the abrasive powder. British Airways PLC said it also conducted a test flight that found no problems. The airlines passed their analyses of flights to their national aviation authorities, which make decisions on airspace closure.
"We asked the authorities to go up there and make real tests," said a spokesman for Germany's Deutsche Lufthansa AG, which flew 10 wide-body jetliners within Germany on Saturday beneath controlled airspace to reposition them but didn't collect atmospheric data.