The Scientific Debate over the Flight Ban 'The Cloud Smells Like a Steam Engine'

Airline executives have attacked the flight ban and dispute whether the ash plume unleashed by the volcano in Iceland is still a threat to flight safety. But researchers counter that while the ash cloud may not be visible, it does exist, can even be smelled, and has already damaged aircraft.
Scientists with the German Aerospace Center (DLR) conducted a research flight on Monday to measure levels of volcanic ash in the country's airspace.

Scientists with the German Aerospace Center (DLR) conducted a research flight on Monday to measure levels of volcanic ash in the country's airspace.

Foto: AP/ DLR
Photo Gallery: Empty Skies over Europe
Fotostrecke

Photo Gallery: Empty Skies over Europe

Foto: MANU FERNANDEZ/ AP
With additional reporting by Volker Mrasek