Damn near fell for the DCC trap on Cathay Pacific's website today! Had never noticed it before, but today I spotted a little drop down menu that just asks you to choose your currency, and I almost fell for it.
Fortunately, I was paying by Amex. But the problem is that (like many of us) I jump around from different location-versions of the website looking for the best fare. I couldn't remember if I was on the Canadian site, the Hong Kong site, or some other country site, and it is very easy to fall into that drop-down menu trap.
At least CX do tell you plainly that you're about to get screwed if you choose DCC:
As an extra benefit, you can now choose to pay for our travel services in one of the above currencies to ensure certainty of the amount charged to your credit cards (for VISA and MasterCard only.) Currency exchange rate is based on a rate determined by a third-party foreign exchange provider, plus 3%.