Seeing there's a lack of info on AA SGN I thought I'd post some details I just got. I just spoke to the AA GSA in SGN.

http://www.aa.com/aa/i18nForward.do?...ts/vietnam.jsp

If anyone has ever done a NRT the process is pretty much the same. But do contact the ATW desk first before contacting the GSA as they don't organise itineraries like NRT, they only issue tickets.

1) They are able to take payment over the phone if eticketing is possible.
2) They do not issue paper tickets in advance and they require your physical presence in their office to issue paper tickets.