нашел я инфу про панаму, с сайта их консульства в США
As of July 21, 2009 there is in effect a new Law regarding tourist visas for entering the Republic of Panama.
Executive Decree #248 states that:
"Those who hold a valid passport for at least 3 months and a valid visa from ONE of the following countries: USA, United Kingdom, Canada, Australia or any of the member countries of the European Union, which has been used at least one time to enter those countries, may enter the Republic of Panama by purchasing a Tourist Card, regardless of their nationality."
*Immigration officials are accepting as valid the entrance of the holders of a United States permanent resident card under this law.
*The tourist card is purchased upon arrival at the Panamanian airport and it has a cost of US$30.00.
*The tourist card is valid for 30 days, renewable at the Office of Migration for an extra period of 60 days.
3 месяца это про срок действия паспорта, а не визы. К визе требование одно - она должна быть использована хотя бы раз.
вот оригинал этого тугамента
http://www.embassyofpanama.org/pdf/cons ... e19022.pdf