EU Ministers are due to hold emergency talks on the air travel chaos caused by plumes of ash from a volcano in Iceland. The crisis is entering its fifth day with airspace remaining closed in over twenty countries. Desperate airlines are putting pressure on EU leaders to lift the flight ban, saying it's already cost them over a billion euros. Some companies have undertaken test flights into European air space to prove its safety. Experts have branded the safety measures 'unnecessary' and described the situation as 'air hysteria'.