Europe's air industry has called for an urgent review of flight bans imposed because of volcanic ash from Iceland. The bodies representing most European airlines and airports have questioned the need for the unprecedented curbs, which affect millions of travellers. Airlines that have carried out test flights say planes showed no obvious damage after flying through the ash. EU Transport Commissioner Siim Kallas said he hoped 50% of Europe's airspace would be risk-free on Monday. He said the current situation was "not sustainable" and European authorities were working to find a solution that did not compromise safety. Please turn on JavaScript. Media requires JavaScript to play. "We cannot just wait until this ash cloud dissipates," he added. Mr Kallas also said EU transport ministers would hold a video teleconference on Monday to assess the situation. About 17 European countries have closed their airspace. The flight bans came amid fears that the ash - a mixture of glass, sand and rock particles - can seriously damage aircraft engines. Airlines are estimated to be losing some £130m ($200m) a day. The European air traffic coordinating agency, Eurocontrol, reports that 63,000 flights have been cancelled since Thursday. There were only 5,000 flights in European airspace on Sunday, against 24,000 normally, it says. ACI Europe - which represents major airports - and the Association of European Airlines issued a joint statement urging officials to reconsider the restrictions. 'Dangerous levels of ash' "The eruption of the Icelandic volcano is not an unprecedented event and the procedures applied in other parts of the world for volcanic eruptions do not appear to require the kind of restrictions that are presently being imposed in Europe," the statement said. COUNTRIES AFFECTED Airspace closed: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, Germany, Hungary, Ireland, Latvia, Luxembourg, Netherlands, Poland, Romania, Slovakia, Switzerland, UK Partial closures: Italy (northern airspace closed until Monday) Norway (most airports open) Bulgaria (Sofia and Plovdiv open) Poland (several airports, including Warsaw, open) Sweden (northern airports open) France (southern airports open) Flights operating: Greece, Lithuania, Portugal, Russia, Turkey, Ukraine, Spain
Live updates on cloud In pictures: Europe grounded Economic impact of closures Earlier, several airlines also questioned the curbs. Peter Hartman, chief executive of Dutch carrier KLM, said there had been "nothing unusual" about a test flight carried out by the airline through the plume, and he hoped to "get permission as soon as possible to partially restart our operations". Steven Verhagen, vice-president of the Dutch Airline Pilots Association, told the Associated Press news agency: "In our opinion there is absolutely no reason to worry about resuming flights." Germany's two biggest airlines, Lufthansa and Air Berlin, also said they had carried out test flights without apparent damage, as did Air France. Air Berlin spokeswoman Diana Daedelow told the BBC: "It is astonishing that these findings... have seemingly been ignored in the decision-making process of the aviation safety authorities." A British Airways Boeing 747 completed a test flight through the no-fly zone at 30,000ft (9.1km) from Heathrow to Cardiff on Sunday. Please turn on JavaScript. Media requires JavaScript to play. While it encountered no problems, no loss of engine performance and no damage to windows, engineers in Cardiff were due to make a more detailed assessment of its engine overnight. Earlier on Sunday, a UK Met Office plane went through the cloud and encountered dangerous levels of ash, showing that the issue is not whether the cloud is real and dangerous but whether its extent can be accurately mapped, BBC business editor Robert Peston writes. One possible solution is to put observation planes in the sky, to give a more detailed picture of the location of ash concentrations, and the UK government is therefore trying to obtain more observation planes, from the military in particular, he adds. Our business editor understands that BA fears it may not be allowed to fly normal services until Thursday at the earliest. Worsening disruption UK Transport Secretary Lord Adonis, said "urgent discussions" were taking place between European and international agencies to ease the chaos. "We want to be able to resume flights as soon as possible, but safety remains my paramount concern," he said.
I am with my husband and two young children stranded in Oslo and tearing my hair out trying to get home
Christine Macandie
Volcano ash: Your stories Weather experts say wind patterns mean the cloud is not likely to move far until later in the week. Brian Flynn, head of operations at Eurocontrol - which co-ordinates air traffic control in 38 nations - dismissed suggestions the authorities were being over-cautious. "With the overriding objective of protecting the travelling public, these exceptional measures have to be taken," he said. Polish funeral Since Thursday, countries across northern and central Europe have either closed airspace or shut key airports.
Iceland volcano in maps How long will ash last? Peston: Airlines to ask for help Britain has extended a ban on most flights in its airspace until at least 1900 local time on Monday (1800 GMT). Ireland is keeping its airspace closed until 1200 GMT on Monday. Germany had allowed six international airports to open on a limited basis on Sunday but has since closed its airspace until at least 1200 GMT on Monday. The Netherlands has announced that Dutch airspace will remain closed until at least 1200 GMT on Monday. Travellers across northern Europe have sought other means of transport, packing out trains, buses and ferries. The restrictions prevented many world leaders, including US President Barack Obama, from attending the funeral of Polish President Lech Kaczynski in the southern city of Krakow. Southern Iceland's Eyjafjallajoekull volcano began erupting for the second time in a month on Wednesday, sending a plume of ash 8.5km (5.3 miles) high into the air. Have you been affected by the volcanic eruption in Iceland or by disruptions to air traffic caused by volcanic ash? Send us your experiences using the form below. Send your pictures or videos to yourpics@bbc.co.uk or text them to 61124 if you are in the UK or+44 7725 100 100 if you are abroad. If you have a large file you can upload it here. Read the terms and conditions A selection of your comments may be published, displaying your name and location unless you state otherwise in the box below.
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Some of Europe's airlines and airports have called into question whether the mass restrictions imposed on the continent's airspace, due to volcanic ash in the area, are necessary. 

Millions of travellers have been stranded by the cancellations; however, some airlines have made test flights to see if there were any immediate effects on jets after flying through ash. Authorities fear that the ash can cause vital aircraft parts, such as the engines, to fail in-flight.

Three large airlines — KLM, Air France, and Lufthansa — have already made test flights.  Ulrich Schulte-Strathaus, the head of the Association of European Airlines (AEA), commented: "Verification flights undertaken by several of our airlines have revealed no irregularities at all; this confirms our requirement that other options should be deployed to determine genuine risk."

KLM, meanwhile, said that it will allow three freight planes to make flights to Asia, and had transferred seven passenger planes from Duesseldorf, Germany to Amsterdam, without any travellers.

"We observed no irregularities either during the flight or during the initial inspection on the ground. We hope to receive permission as soon as possible after that to start up our operation and to transport our passengers to their destinations." said KLM chief executive Peter Hartman.

ACI Europe and the AEA also commented about the issue in a statement: "While Europe's airlines and airports consider safety to be an absolute priority, they are questioning the proportionality of the flight restrictions currently imposed." "Airlines must be able to fly where it is safe to fly and make decisions accordingly. It is what our passengers demand of us."

Airport closures and cancellations are estimated to be costing airlines about US$200 million daily, the International Air Transport Association reports.

The operations control head for Eurocontrol, Brian Flynn, rebuffed notions that aviation officials were being too cautious, describing the issue as an "unknown phenomenon". "With the over-riding objective of protecting the travelling public, these exceptional measures have to be taken," he remarked. "... As soon as we are able to, with confidence, and when I say we, I mean the entire community of aviation experts and aviation authorities, are able to declare parts of the air space and airports open that will be done."