More than a dozen airports in Northern Spain have been forced to close because of volcanic ash clouds in Spanish air space, according to the BBC.
The country's airport management agency, Aena, said nine airports were already closed with another six due to ground aircraft from midday local time.
The BBC said a number of flights between Europe and North America were being diverted to avoid the 1,200-mile cloud.
Aena said the airports affected are Bilbao, San Sebastian, Vitoria, Zaragoza, Pamplona, La Rioja, Santiago, A Coruna, Vigo, Asturias, Santander, Leon, Valladolid, Burgos and Salamanca.
Last month, thousands of travellers were stranded after ash shut down airspace across Europe.