STOCKHOLM/REYKJAVIK (Reuters) - Iceland's volcanic eruption has died down and is no longer spewing out ash, officials said on Wednesday and airlines began to get back to normal after cancelling about 1,000 flights in northern Europe. European air traffic agency Eurocontrol said it expected the ash cloud would dissipate overnight and did not see any significant disruption to travel in Europe on Thursday. The explosion of the Grimsvotn volcano on Saturday caused much less chaos than an eruption last year at another Icelandic volcano thanks to new rules for airlines, but the incident showed problems remain with the regulations. Budget airline Ryanair was vocal in its criticism.