A UK airline owned by Lufthansa has hit out at the way authorities are handling volcanic ash problems.
British Midland International (formerly bmi) says airspace is being closed unnecessarily.
Chief executive Wolfgang Prock-Schauer told media: "It is becoming increasingly obvious that the current rules implemented in the European Union (EU) in predicting volcanic ash concentrations are not accurate enough and lead to unnecessary closure of airspace.
"The experience of other areas of the world with high volcanic activity has to be taken into account".
Main European air disruption yesterday was with flights to and from Spain and Portugal, which were hit by the ash cloud over the weekend.
Some transatlantic flights were diverted, as well.
