Originally Posted by yyzgigi
The only issue I see is if you wanted a MP credit card. These are generally limited to US residents and I am pretty sure UA and Chase would talk. If you don't have a credit card cannot see any big drawbacks.
I do not see that would be too problematic. If you move to foreign country, it is not usually possible to get CC from the new country as you do not have credit history. In that case, many people keep their CC from old country with friends or family's address as billing address. So long as you are not delinquent in payment, I do not see any problem.