chrb writes: The eruption of Eyjafjallajökull has led to flights being cancelled across the E.U.. With travel chaos ensuing and the airlines losing an estimated $200 million dollars per day, E.U. authorities are coming under increasing pressure to re-open the airways. Test flights conducted on Saturday were apparently successful, with no problems encountered during flight. Following the test flights, Peter Hartman, CEO of KLM, said "We hope to receive permission as soon as possible after that to start up our operation and to transport our passengers to their destinations." Evidence possibly opposing this move comes from the Finnish Defense Forces, which released photos and a statement after F-18 Hornets flew threw the ash cloud, stating "Based on the pictures, it was discovered that even short flights in ash dust may cause significant damage to an airplane's engine". Is it safe to resume flights so soon, or should planes remain grounded until the ash cloud has dissipated?