Mixing Asia Miles and QFF - I have switched over to QFF now but still have some points on Asia Miles / Marco Polo that I need to use up.

Mixing Asia Miles and QFF - I have switched over to QFF now but still have some points on Asia Miles / Marco Polo that I need to use up. To keep my QFF status, I always use my QFF number, even if I am flying CX. Do you think it will be possible to buy a CX ticket, and use Asia Miles to upgrade, while getting QFF points and status credits?

You should be able to upgrade with Asiamiles and credit to QFF. When you buy the ticket and upgrade with miles it should state your new class of travel in your itinerary and it is not dependent on your FF number on your BP. This is unless CX has a similar system as QF where you can be upgraded until the very last moment, in which case your Asiamiles number should be quoted as your upgrade might depend on status in Asiamiles and it is needed to process the upgrade.

You can always leave the Asiamiles number on your itinerary and ask to switch it to the QF booking when checking in. As long as your QF number is qouted on your BP / when you check in (online or at airport) you will get the credits and miles on your QF account.

Short version: maybe, but I wouldn't bet requalifying or scraping in with just enough award points on it. 

It may in theory be possible to (for example) buy a Cathay economy ticket and upgrade it with Cathay miles, yet credit it to Qantas. But you should double check at every point in your journey that the QFF number has stuck — booking, telephone a day or two beforehand, at check-in, in the lounge, at the podium, on the plane (the crew's manifest is often a good check here), and on arrival.

I'd also try to get a response in writing (via email, perhaps) that the QFF number has been entered. If it goes awry, that'll stand you on a better leg to follow up with them.

I think you would be able to check if the QF FF has been entered correctly when checking your online profile on the QF site. If it is not noted down correctly I doubt you see the flights displayed in the "My bookings" section. As long as it is on your boardingpass as the sole number (in the FQTS section - Frequent Traveller Service Information) you should be right.

Bottomline I agree that double checking is the way to go. 

Thanks a lot for the great replies.

I was checking points required to upgrade PE to Business on SYD to HKG - 12,500 Asia Miles if flying CX, 25,000 if flying QF! I know usually 1 CX point can redeem a bit more than QF, usually like 1:1.5, but surprising to see 1:2!

I would recommend keeping the CX number on the booking with the upgrade request,

then at checkin/lounge requesting a change to QF number and a new boarding pass with that QF number.

FYI - The system "should" be smart enough that you are only awarded points for the non-upgraded class.