Most German Airports closed indefinitely. Other European Airports effected by ash.

Flights at Frankfurt and other German airports were halted indefinitely today as a high-altitude cloud of volcanic ash from Iceland spread further over Europe.
No flights were landing or departing from the Frankfurt airport - the biggest in Germany and the hub for Lufthansa's worldwide operations - from 8 am, an airport spokesman said.
The airport was not formally closed, however, and operations could quickly resume once meteorological conditions improve, he added.
Elsewhere in Germany, flights were grounded at Berlin, Cologne, Düsseldorf, Hamburg, Bremen, Hannover, and other smaller airports.
The ash floating thousands of kilometres from Iceland’s Eyjafjallajokull volcano has also forced the unprecedented closure of airports across Europe.
The European Organisation for the Safety of Air Navigation (Eurocontrol) said in a statement it expected around 11,000 flights on Friday in European airspace, down from the normal 28,000.
Besides the airports closed in Germany, airspace is not open to civilian aircraft travel in Ireland, the UK, Belgium, the Netherlands, Denmark, Sweden, Norway, Finland, Estonia, the north of France including all Paris airports, and parts of Poland including Warsaw airport, Eurocontrol said.
“Planning to fly to or within northern Europe in the next few days? Best check with your airline for flight cancelations caused by the Volcanic Ash – For Airline Contact Numbers, Click here