The ARRL has begun issuing the International Amateur Radio Permit (IARP) that allows US amateurs to operate from Argentina, Brazil, Peru, Uruguay, and Venezuela without having to obtain a special license (the US and Canada also are CITEL signatories). The IARP is valid in any country that is a signatory to the CITEL Amateur Convention.
The Class 1 IARP--available to Tech Plus and higher class licensees--requires knowledge of Morse code and carries all operating privileges. The Class 2 IARP--equivalent to the US Technician ticket--does not require knowledge of Morse code and carries all privileges above 30 MHz. An IARP is not a license, but it certifies the existence of a license.
Complete information on IARP operation, including an IARP application form, is available from the International Operating page on ARRLWeb at http://www.arrl.org/field/regulations/io/.
These new IARPs affect operation only in participating and CITEL (Central and South American) countries. They do not change the procedures for US hams wishing to operate overseas in countries that are not CITEL Amateur Convention signatories.