In an effort to try to take control of the situation, EU transport ministers have created a core no-fly area, a limited-service zone and an open-skies area.
The EU Commissioner for Transport, Siim Kallas, has rejected criticism that the EU took too long to respond to the crisis.
Addressing the European Parliament in Strasbourg, Mr Kallas said the matter was not "in the hands of arbitrary decisions", as the lives of people were at stake.
The airline industry says its losses have soared to over $1bn (£650m; 740m euros), since much of Europe's airspace was closed last week because of volcano ash.
The flight ban was imposed because in the high temperatures of an engine turbine, ash can turn to molten glass and cripple the engine.
In a sign of the impact of the crisis on Asia's export-driven economies, the Japanese car giant, Nissan, says it is suspending several production lines due to the shortage of parts from Ireland. Honda will also partly halt production.
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