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They held up a makeshift sign saying, "We want to come back home," each word written on a separate piece of paper and held by an individual traveler. "We need a flight, we need a time," Thierry Loison, who has been stuck at the airport since Friday on the way back to France, told Korean Air officials. "We were like animals this morning." Passengers complained about having to sleep on the airport floor due to a lack of hotel rooms and said they were only receiving a voucher for one meal a day at McDonald's. Some were running out of money. "We are on the floor," Andrew Turner, a graduate student en route to London after a holiday in Sydney, told Korean Air officials, referring to sleeping accommodations. "We have one meal a day ... at the moment a lot of people are not eating." KLM Royal Dutch Airlines said it had flown four planes Sunday through what it described as a gap in the layer of microscopic dust over Holland and Germany. Air France, Lufthansa and Austrian Airlines also sent up test flights, although most traveled below the altitudes where the ash has been heavily concentrated.
"There is currently no consensus as to what consists an acceptable level of ash in the atmosphere," said Daniel Hoeltgen, a spokesman for the European Aviation Safety Agency. "This is what we are concerned about and this is what we want to bring about so that we can start operating aircraft again in Europe." Meteorologists warned, however, that the situation above Europe remained unstable and constantly changing with the varying winds
-- and the unpredictability was compounded by the continuing eruptions. Ash and grit from volcanic eruptions can sabotage a plane in various ways: the abrasive ash can sandblast a jet's windshield, block fuel nozzles, contaminate the oil system and electronics and plug the tubes that sense airspeed. But the most immediate danger is to the engines. Melted ash can then congeal on the blades and block the normal flow of air, causing engines to lose thrust or shut down. Scientists say that because the volcano is situated below a glacial ice cap, magma is being cooled quickly, causing explosions and plumes of grit that can be catastrophic to plane engines, depending on prevailing winds. "Normally, a volcano spews out ash to begin with and then it changes into lava, but here it continues to spew out ash, because of the glacier," said Reynir Bodvarsson, director of Swedish National Seismic Network. "It is very special."
[Associated
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