One benefit of the Cathay Pacific American Express card is the 10% off fees charged by Asia Miles for buying, transferring or renewing miles. I can't find this anywhere but would like to know in what situation will it apply. Do I have to be the donor, or can I be the receipient, or even as an unrelated party who is willing to use his card to pay for the transaction? Is this benefit applicable for sup' card holders?

A similar question on buying tickets online at CX.com. If a supplementary card holder uses his card to buy a ticket for himself online. Who gets the online bonus miles?

from the T&C at: http://www.americanexpress.com/hk/en...conditions.pdf

to your questions:

• seems all only apply to the basic cardmembers - so supp card holders buying tickets won't be eligible for bonus miles
• seems like you need to be the MPO account holder of the account where you want to transfer miles from, where you buy miles into, or where you want to renew the miles...

CATHAY PACIFIC AIRWAYS BENEFITS
The following Cathay Pacific Airways benefits apply to Basic Cardmembers only when effecting payment The American Express® Cathay Pacific Credit Card / The American Express® Cathay Pacific Elite Credit Card. Any Bonus Asia MilesTM will be credited directly to Basic Cardmember's Asia Miles account within 4-6 weeks of the qualifying transaction.

TERMS & CONDITIONS

Free Marco Polo Club Green Tier membership
US$50 enrolment fee will be waived when Cardmember applies for membership online through www.cathaypacific.com after successful application of the Card. Free Green Tier membership is valid for 12 months and can be renewed upon traveling a minimum of 4 Club sectors. The Marco Polo Club terms and conditions apply. For more information on membership benefits of The Marco Polo Club, please visit www.cathaypacific.com.

Cathay Pacific inflight shopping bonus
Applicable only on Cathay Pacific operated flights. Cardmember must present his Marco Polo Club / Asia Miles membership card at time of purchase for Asia Miles crediting. A minimum net spending of HK$500 on a single sales receipt applies. Cathay Pacific will credit the Cardmember with 2 Asia Miles for every HK$5 of spending.
Full payment must be made by The American Express Cathay Pacific Credit Card / The American Express Cathay Pacific Elite Credit Card. Home delivery items and payment by vouchers are not eligible to earn Asia Miles. Offer cannot be used in conjunction with The Marco Polo Club inflight shopping bonus.

Cathay Pacific online booking bonus
Applicable only to Cathay Pacific revenue tickets purchased online through www.cathaypacific.com. Excludes travel itineraries originating from mainland China, India, Indonesia, the Philippines and South Africa. Cardmember must log in using his own Marco Polo Club / Asia Miles membership number and must be traveling personally. Cathay Pacific will credit the Cardmember with 1 Bonus Asia Mile for every HK$8 of the ticket fare. Award redemption bookings made online are not applicable.
Full payment must be made by The American Express Cathay Pacific Credit Card / The American Express Cathay Pacific Elite Credit Card.

Cathay Holidays bonus for “Discover the Difference Selection” travel packages
Applicable only to travel packages branded under the “Discover the Difference Selection” and purchased directly from Cathay Holidays Limited. Cardmember must indicate his Marco Polo Club / Asia Miles membership number at time of purchase for Asia Miles crediting and must be traveling personally. Cathay Pacific will credit the Cardmember with 1,000 Bonus Asia Miles for every travel package he purchases. Cardmember’s traveling companions are not eligible for Bonus Asia Miles.
Full payment must be made by The American Express Cathay Pacific Credit Card / The American Express Cathay Pacific Elite Credit Card.

10% discount on Asia Miles mileage renewal fee, mileage transfer fee, and purchase fee of Asia Miles Gift Miles
Applicable only to transactions completed online through www.asiamiles.com. Cardmember must log in using his own Marco Polo Club / Asia Miles membership number and be the same member who renews, transfers Asia Miles or purchases Asia Miles Gift Miles. For relevant terms and conditions, please visit www.asiamiles.com.
Full payment must be made by The American Express Cathay Pacific Credit Card / The American Express Cathay Pacific Elite Credit Card.

Slightly OT, what happens if I purchase a ticket on CX.com originating from LHR? Would that count as an overseas purchase because it is charged in GBP?

Yes..

Thanks!