Despite flights, volcano travel chaos not over

Passengers line up for tickets at the Westbahnhof railway station in Vienna, Austria, Monday, April 19, 2010. Travelers crowded train stations as flights remained grounded in large parts of the continent as authorities across Europe said there was no end in sight to the plume spewing out of a volcano in Iceland. (AP Photo/Ronald Zak) (AP Photo/Ronald Zak)

April 20, 2010 9:35:29 PM PDT
Europe's busiest airport reopened Tuesday as air traffic across the continent lurched back to life. But the gridlock created by Iceland's volcanic ash plume was far from over: Officials said it would be weeks before all stranded travelers could be brought home.