今天查了一下IATA上关于哥斯达黎加签证的规定，除了常见的美国绿卡免签之外，还有
两条比较奇葩的规定：
1. Visa required, except for Residents of the USA: for holders of a US
Employment Authorization Card (form I-766)。头一次见到IATA数据库里面提到EAD
卡。不知道这个是仅限于交了485以后的EAD卡呢，还是所有的EAD卡都可以呢（比如F1
OPT，或者最新的H4等等）？
2. A "Restricted Visa" (accompanied by approval from the General Director of
the Immigration and Foreign Administration Department) is required for
holders of passports issued by China (People's Rep.). Exempt are: holders of
an ID card and proof of being permanent residents in Beijing or Shanghai
for a minimum of 8 years. 这条竟然专门对北京上海居民区别对待。虽然这条的意思
应该是说北京人和上海人不需要"restricted visa"，普通visa就可以了，不过也说不
定那天直接北京上海人就免签了。
