Most of Europe's airspace has been reopened to traffic, days after a cloud of volcanic ash from Iceland caused some of the worst disruption in aviation history. German airspace was opened completely at 11 o'clock local time, and other countries across the continent have made similar moves. The European air traffic agency Eurocontrol says it expects 21-thousand flights to operate during the course of Wednesday - about 25-percent fewer than usual. Airlines say it will be days before normal service can be resumed.