Blow to carriers may surpass 9/11

Farmer Bjarni Thorvaldsson works to clean off volcanic ash that accumulated on a barn roof from an erupting volcano near Eyjafjallajokull on Sunday. The erupting volcano in Iceland sent new tremors on Monday, but the ash plume, which has caused air traffic chaos across Europe, has dropped to a height of about 2 km, Iceland's Meteorological Office said. Lucas Jackson / Reuters