Millions of stranded travellers face further air chaos as the volcanic ash from Iceland that has closed most of Europe's airspace continues to spread. Estimated three-quarters of flights were cancelled yesterday. About 20 countries closed their airspace some have extended flight bans into Monday.<br/><br/> The International Air Transport Association predicted little or no improvement today. It said, airlines are losing some 200 million dollars a day in an unprecedented shutdown of commercial air travel. Disruption is now said to be greater than that after 9/11 and the volcanic activity shows no sign of abating. In some small areas the volcanic fallout has been significant. It is clogging car engines, turning grass grey and reducing visibility to just a few meters.<br/><br/>The travel chaos has been felt as far away as North America and Asia, with dozens of Europe-bound flights being cancelled. Unable to catch flights, commuters across northern Europe have sought other means of transport, packing out trains, buses and ferries. Meanwhile, two airlines have carried out test flights to see if it is safe to fly. <br/><br/>The Netherlands' KLM said one of its planes, a Boeing 737, had reached its maximum operating altitude of about 13km in the skies over the Netherlands, and there had been no problems during the flight. The aircraft and its engines were being inspected for possible damage.<br/><br/>After the results of that technical inspection the airline hopes to get permission from the aviation authorities to start up operations again. Germany's Lufthansa said it had flown several planes to Frankfurt from Munich. <br/><br/>A spokesman of the airlines said, all airplanes have been inspected on arrival in Frankfurt but there was no damage to the cockpit windows or fuselage and no impact on the engines.