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(CNN) -- Volcanic ash from an Icelandic eruption could reach British airspace Tuesday, sooner than previously predicted, Britain's Civil Aviation Authority warned Monday. The ash forced the closure of Icelandic airspace over the weekend, raising the specter of the kind of disruption of trans-Atlantic and European air travel that took place last year.
But the CAA said new arrangements have been put in place since last year's eruption of another Icelandic volcano that should reduce the number of flights that have to be canceled if the ash cloud spreads.
Iceland hopes its main international airport will reopen to air traffic Monday, following the eruption of Grimsvotn over the weekend, a spokeswoman told CNN.
There were no international flights in or out of the country on Sunday after Europe's most active volcano began to erupt on Saturday.
Icelandic officials will reassess the situation Monday and hope to be able to reopen airspace, Keflavik International Airport
spokeswoman Hjordis Gudmundsdottir said.
Last year, trans-Atlantic and European air traffic was snarled for weeks by an ash cloud from the other volcano, Eyjafjallajokull.
The Grimsvotn volcano under the Vatnajokull glacier erupted Saturday, according to the Icelandic Meteorological Office.
The last eruption of the volcano was in 2004, CNN affiliate TV2 Iceland reported.