Mercosul Airpass (www.allairpass.com) is valid within Argentina, Brazil, Chile (except Easter Island), Paraguay and Uruguay. Participating airlines include Aerolíneas Argentinas (AR), Aerolíneas Del Sur (AS), Pluna (PU) and VARIG Airlines (RG). The pass can only be purchased by passengers who live outside South America and must be booked in conjunction with an international ticket. It is valid for seven to 45 days.
The South American Pass is valid on Aerolíneas Argentinas (www.aerolineas.com.ar) and Austral (its domestic subsidiary) flights only. The pass can only be purchased by passengers who live outside South America and whose international flights are booked with Aerolíneas Argentinas. Up to 10 flight coupons are allowed and it is valid for seven to 45 days.
Oneworld Visit South America Pass (www.oneworld.com) is valid within Argentina, Bolivia, Brazil, Colombia, Chile (except Easter Island), Ecuador, Paraguay, Peru, Uruguay and Venezuela. Participating airlines are American Airlines (AA), British Airways (BA), Cathay Pacific (CX), Finnair (AY), Iberia (IB), LAN (LA) and Qantas (QF). The pass must be bought outside South America in the country of residence. It allows unlimited travel to over 30 destinations. You can take as many flights as you like, but a minimum of three flights must be booked.