Where is your card based? Often times, they have special deals for each country anyway. As far as processing, I can't guess BUT I know from my experience with Asiana that they treat their Korean purchased transactions completely differently. For example, I contacted the English line for a refund (I was routed to the US center), but they couldn't help me. The Korean local line refunded me immediately, whereas I had to send for an email request using the US line. Long story short, just book in the country of residence where your card is based.