Check out the Terms and Conditions at Asia Miles website under "Air Travel Credits" where you will find all the sub-classes by airline listing.

I have provided a direct link here for your quick reference. I hope this answers your question.

http://www.asiamiles.com/am/1,,22481...rtravelcredits

Asia Miles is Cathay Pacific's frequent flyer programme and Marco Polo Club is their recognition programme where you earn your status by flying Cathay Pacific and oneworld airline partners.

I am a member of Asia Miles and Marco Polo Club and have found their services to be excellent. Another good feature of the Asia Miles FFP is the fact that you can use miles to upgrade on Cathay Pacific, British Airways, Swiss Air Lines, China Eastern, Vietnam Airlines, Dragonair, American Airlines and Aer Lingus - an impressive list by all standards.

If you have any further questions, please let us know - more than happy to assist.