In this thread from 2008-2009 the OP reported that the Visit Asia flights booked into M class:
http://www.flyertalk.com/forum/onewo...ticketing.html
You might try a PM to the OP of that thread or the OP of the following thread(who also reported the purchase of a visit asia pass) for further information:
http://www.flyertalk.com/forum/onewo...ght=visit+asia