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Airlines are keeping an eye on possible volcanic activity in Iceland, after a previous eruption there in 2010 caused massive flight disruptions. But simmering seismic activity around the Bárdarbunga volcano hasn't yet altered flights.

"We've been aware of the reported increasing potential of volcanic activity through aviation and government sources for a few days," said Morgan Durrant, a Delta spokesman. "We'll continue to closely monitor the situation."

"We are closely observing the developments. However, currently there is no reason for operational measures," said Christina Semmel, a Lufthansa spokeswoman.

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"We always take a look at and monitor routes that may be affected," said Mary Ryan, a United spokeswoman.

The caution comes because ash from Iceland's Eyjafjallajökull volcano canceled more than 100,000 flights, affecting 10 million passengers, in April 2010.

The International Air Transport Association, which represents 240 airlines worldwide, said carriers lost about $1.8 billion during six days of cancellations.

Silicates in volcanic ash threaten aviation because they can gum up a plane's engines. But airlines also complained at the time that broader sections of airspace were closed based on theories rather than testing where the ash cloud was too thick to fly safely.

An international industry task force met for years after the earlier eruption, and a consensus was reached to treat ash like any other meteorological hazard, with airlines continuing to operate in areas where the risk is considered acceptable.

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