A weekend windstorm kicked up so much ash from the Chilean volcano that flights were cancelled in Chile, Argentina, Brazil, and Uruguay.
Air travel in South America has been problematic since the Cordon Caulle volcano began erupting in June. However, this time, the cancellations were not due to an eruption, but rather winds gusting up to 75 mph. The winds kicked up ash that had accumulated across Patagonia. With the onset of spring, snow is melting and there is nothing to hold the ash in place.
A huge cloud of ash enveloped Buenos Aires and Montevideo on Sunday and grounded hundreds of flights through Monday afternoon.
There is no ash. The weather conditions improved and there are no particles on the surface, a spokesman for Aeropuertos 2000, which operates the two major airports in Buenos Aires, said Monday afternoon.
Later in the day, airlines in Uruguay also took to the air again.
Most flights are now operating between the two countries, an official at Montevideo's Carrasco International Airport told AFP.
Brazilian airlines GOL and TAM said that they too had resumed flights by Monday afternoon.
When the Chilean volcano began erupting in June, it generated an ash cloud that traveled around the Southern Hemisphere twice, cancelling flights across South America and as far away as Australia and New Zealand.
Chilean towns near the volcano have been under a red alert since June, while damage to livestock and crops from the ash led Argentina to declare an agricultural emergency in the southern provinces of Rio Negro, Chubut and Neuquen.