A plane is seen against a sunset over Kensington Palace in London, Monday, May, 23, 2011. A dense cloud of ash from an Icelandic volcano was being blown toward Scotland Monday, forcing two airlines to... more 
A plane is seen against a sunset over Kensington Palace in London, Monday, May, 23, 2011. A dense cloud of ash from an Icelandic volcano was being blown toward Scotland Monday, forcing two airlines to cancel their flights, U.S. President Barack Obama to cut short his visit to Ireland and carriers across Europe to fear a repeat of the huge disruptions that stranded millions of passengers a year ago. less 
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Associated Press | Photo By Alastair Grant
Mon, May 23, 2011 4:39 PM EDT