Airlines in South America say they are resuming flights after volcanic ash which had grounded planes, began to disperse. Flights in several countries of the region have been severely disrupted by ash spewing from Chile's Puyehue-Cordon-Caulle volcano range, about 800 kms south of Santiago.Argentina's main airport in Buenos Aires has reopened, though some smaller airports remain closed. Aviation officials said about 60 flights – domestic and international – from Ezeiza and Aeroparque airports in Buenos Aires had been cancelled.