eracode:
Thanks to all who responded - very helpful.
One more qn: I guess Airpoints Dollars are OK to use as payment/part payment for 'deal' fares?
You can't (yet) use Airpoints dollars for part payment unless you're part of a new trial offering this. If you want to pay for a fare and don't have enough Airpoints Dollars you'll need to purchase these to top up your account.
If you pay for a fare using Airpoints Dollar you won't earn Airpoints Dollars or Status Points - so most frequent flyers don't do it.