Originally Posted by
christep
No it's NOT. The fare is absolutely nothing to do with the billing country of your credit card.
The fare is based on the point of purchase. This is completely independent of the billing country of your credit card.
I second christep, and there are some complicated issues about billing address.
The billing addoress(country) of credit card and the contry in which card are issued are not always same.
For example, I have a credit cards issued in HK,UK,JP. All cards' billing address are my real residence in Japan. So, you can not determine 'real billing address' by the country in which credit card are issued.
FYI, charged currecny are not alwasy same one used in issued country.
Some banks in Japan issued USD credit cards. Some banks in UK issued USD and EUR based credit cards.