Airlines are now sending planes into the volcanic ash cloud, but aviation expert Clive Irving explains why test flights may not be accurate—and why the eruption could ruin travel for years.
An aerial handout photo from the Icelandic Coast Guard shows a plume of steam rising 22,000 feet (6700 meters) from a crater under about 656 feet (200 metres) of ice at the Eyjafjallajokull glacier in southern Iceland April 14, 2010. (Reuters)