Millions of people have been affected by flight cancellations in Europe and across the world [AFP]

List of countries across Europe with flight disruptions due to the volcanic ash cloud as of 9:00 GMT on Wednesday:

Austria - Austria reopened its airspace on Monday but some flights remain cancelled.

Australia - Qantas will continue to cancel its flights to Europe until at least the end of Wednesday.

Belgium - Flight restrictions were partially lifted from 06:00 GMT on Tuesday.

Bosnia - Airports open.

Britain - All UK airspace reopened at 21:00 GMT on Tuesday.

Bulgaria - All airspace and airports open.

Czech Republic - Air space reopened on Monday. Prague airport has confirmed two-thirds of normal daily flights for Tuesday.

Croatia - Airspace and all airports open. Croatia Airlines, the national carrier, restored all domestic and international flights on Tuesday.

Denmark - All airspace to open at 9:00 GMT Wednesday.

Estonia - Airspace reopened at 20:00 GMT on Tuesday.

Finland - Airspace open until further notice, and most airports to be in operation by 09:00 GMT on Wednesday.

France - The two main airports in Paris, Roissy and Orly, opened from 06:00 GMT on Tuesday to allow a limited number of flights. Most French airports now open to limited traffic. Air France plans to run all long-haul flights on Wednesday, but some flights to northern Europe remain suspended.

Germany - Airspace gradually reopening on Wednesday, to be fully
reopened from 9:00 GMT.

Hungary - Airspace open since Monday, with minor restrictions overnight. About 15 flights departed early Tuesday.

Iceland - Air space open but many flights to Europe cancelled.

Ireland - Airspace reopened.

Italy - Airspace reopened.

Latvia - Airspace reopened at 06:00 GMT on Tuesday.

Lithuania - Airspace is open. There have been departures from Vilnius International Airport. But all flights at Kaunas airport have been cancelled.

Luxembourg - Luxembourg Airport reopened at 08:00 GMT on Tuesday.

Moldova - Resumed international flights from 07:30 GMT.

Montenegro - Airports open.

Netherlands - Passenger flights began on Monday. Night flights resumed on Tuesday.

Norway -  Aviation officials opened Norwegian airspace on Tuesday afternoon until at least 12:00 GMT on Wednesday.

Poland - Polish Air Navigation Services said airspace will be open at 05:00 GMT Wednesday.

Romania - Airspace reopened on Monday at 18:00 GMT with all airports operating.

Russia - All airports open. Aeroflot flying to the United States via the North Pole.

Serbia - Airports open.

Slovakia - Reopened its airspace on Monday at 12:30 GMT, but Ryanair cancelled all Tuesday flights from Bratislava.

Slovenia - Airspace reopened at 10:00 GMT on Tuesday.

Spain - Reopened all airports on Sunday.

Sweden - Most airports open. Airports in Stockholm and Gothenburg to open at 13:00 GMT on Wednesday.

Switzerland - Reopened as scheduled at 06:00 GMT on Tuesday but some flights were cancelled at Geneva and Zurich airports.

Turkey - All airports open. Planes flying out of the Black Sea cities of Samsun, Sinop and Zonguldak have been advised not to fly higher than 6,000 metres.

Ukraine - Kiev's Borispol international airport open.

Source: Agencies