We flew our first international trip since obtaining this credit card, and upon arriving in Tokyo and trying to use the card for JR train tickets, our card was denied. It was continued to be denied at JR and at locations where we tried to charge more than $100 at a pop during our two weeks in Japan. We called upon return to the U.S. and were told that Citibank was trying to protect us from those inappropriately using our card. What a difference between the fine services offered by American Express and AA's Citibank card. This was the second problem we have had with this card since obtaining it in December and find it useless if we cannot use it to obtain the benefits that one is supposed to obtain.