This aerial image shows the crater at the summit of the volcano in southern Iceland’s Eyjafjallajokull glacier Saturday April 17, 2010. A lingering volcanic ash plume forced extended no-fly restrictions over much of Europe Saturday, as Icelandic scientists warned that volcanic activity had increased and showed no sign of abating _ a portent of more travel chaos to come. Although the ash plume has grown, a northerly wind was expected to allow enough visibility for scientists to fly over the volcano Saturday. (AP Photo/Jon Gustafsson /Helicopter.is) ** ICELAND OUT **