Just got the flyer from American Express AU:
Earn 10 additional Amex Membership Rewards per dollar spent and $50 discont on return Economy class from Australia to NZ. Book through www.airnewzealand.com.au and pay on American Express AU card.
Promoional period: 2-22 November 2009
Travel Periods: 1/2-26/3/2010, 19/4-30/6/2010
Promo Code: AMEX50
More info here.
PROMO CODE INFORMATION Promo Code: AMEX50
$50 discount on return Economy Class fares from Australia to New Zealand
Sales end:22 Nov 09
Travel period:01 Feb - 26 Mar and 19 Apr - 30 Jun 10
Terms & Conditions
Use promo code AMEX50 to receive a $50 discount off your next airfare from Australia to Auckland, Wellington, Christchurch, Rotorua or Queenstown in New Zealand. Offer applies to return bookings, direct services, per adult, with travel originating in Australia. Offer is valid for sale from 22 Nov 09 for travel 01 Feb to 26 Mar 10 & 19 Apr to 30 Jun 10. The discount applies to the K Class Smart Saver fare in Economy Class inclusive of taxes & surcharges. Only one promo code per purchase is permitted. Payment must be made in full on an eligible American Express Card. This offer is only available to the Cardmember.The promo code discount does not apply to promotional sale fares or child/infant fares. If a promo code booking is purchased and subsequently changed to travel outside the stated promo travel period a new fare will need to be purchased at the applicable fare level available. All rules and terms and conditions of fare type purchased will apply.