Due to volcanic ash at high altitudes, both UA and AA have suspended all flights to/from Argentina until further notice. The Chaitén volcano is still in an eruptive stage, and ash is present between 20-25K ft north of BsAs.

Flight operations of LAN and AR have been severely affected domestically as well.

http://www.lanacion.com.ar/informaci...04531&toi=5812

I suspect other international airlines will also follow suit.

John