CHICAGO — Airlines are on alert as one of Iceland’s biggest volcanoes rumbles to life, threatening ash clouds that could force flight cancellations across the North Atlantic, the busiest international travel market.Air France, Deutsche Lufthansa and Delta Air Lines are among carriers watching Bardarbunga volcano for an eruption, the latest in a series of interferences with air routes.Concerns were raised of a repeat of the 2010 disruptions when an ash cloud from the Eyjafjallajokull volcano forced carriers to erase more than 100,000 flights, losing about $1.7bn in revenue. Ash is a menace to jetliners because the glass-like particles can damage engines by melting and congealing."There is still no sign of this intrusion being on its way to the surface," said Martin Hensch, a seismologist at the Icelandic Meteorological Office. "It’s still impossible to say whether or not the volcano will erupt, due to the simple fact that we can’t predict … the developments in the next hours or days ...

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