Thank you everyone for the very helpful comments and suggestions. You helped me figure out that he needs to be on one airlines from JFK to BKK and that the best carrier is JAL for this as a person is considered an adult at 12 yrs old which eliminates the red tape. So that ticket is bought. Next is to get him the DTV which he qualifies automatically for through mine. Thanks again
If your name is on the BC, take it to the US Embassy to get your child US Citizenship, then when his passport comes in, apply for Thai citizenship for the child, getting him dual citizenship. I don't get why you wouldn't think to report the birth to the US Embassy.