Italy closed a large part of its airspace in the north of the country until at least the early afternoon on Sunday to counter the risk posed by volcanic ash coming from Iceland, the civil aviation authority ENAC said.
The block on flights began at 0600 GMT (0800 local time) and would last until at least 1200 GMT, ENAC said.
The closure would not affect the airspace in the eastern part of northern Italy and the airports of Venice, Trieste and Rimini would remain open, ENAC said.
A bulletin issued on Sunday by the Volcanic Ash Advisory Center said the ash cloud should stay over Italy until Sunday evening.
Several Spanish airports in northern Spain including Barcelona reopened on Sunday after being shut on Saturday as a precaution against the ash cloud.
The Spanish civil aviation authority said only three airports remained closed, all in the north-western region of Galicia, and that these might open from about 0900 GMT. They were Santiago, La Coruna and Vigo.
The government has warned that Spanish airspace could be hit again in the coming week, depending on the trajectory of the ash cloud.
Ireland expects to impose restrictions to traffic at western airports later on Sunday as ash from the Icelandic volcano drifts back over the country.
In Portugal, the airport in the country's second city, Porto, was shut until midday (1000 GMT), while the French aviation authority said some 30 flights from Paris to southern Europe were cancelled, though French skies were open.
ReutersLast Mod: 09 Mayıs 2010, 16:12