PARIS-The Icelandic volcano that has kept much of Europe land-bound is far from finished spitting out its grit, and offered up new mini-eruptions Saturday that raise concerns about longer-term damage to world air travel and trade.Facing days to come under the volcano's unpredictable, ashy plume, Europeans are looking at temporary airport layoffs and getting creative with flight patterns to try to weather this extraordinary event.Modern Europe has never seen such a travel disruption. Air space across a swath from Britain to Ukraine was closed and set to stay that way until Sunday or Monday in some countries, affecting airports from New Zealand to San Francisco. Millions of passengers have had plans foiled or delayed.Activity in the volcano at the heart of this increased early Saturday, and showed no sign of abating."There doesn't seem to be an end in sight," Icelandic geologist Magnus Tumi Gudmundsson told The Associated Press on Saturday. "The activity has been quite vigorous overnight, causing the eruption column to grow."