As already mentioned in a thread before, I lost passport containing my non-immigrant visa O A. Renewing this visa is a bureaucratic nightmare in my country, so TV members advised me to apply for the non-immigrant O visa, and while in THailand convert it to the orginal O A; as this would be the most appropiate way to avoid horrendous bureaucratic BS> . My questions to this matter are: What is the formal or even practical difference between a non-immigrant visa O and the one O A? What ki