Lets say asia region.
At the check in reception, there will be a display of currency, usually you will see USD, EURO, YEN etc. There is no SGD.
Most of the time is YEN, imho, represent as an asia active currency?
Why they dont put RMB, MYR, SGD etc?
Since prc the population so big, why not RMB?
I just curious
I always learn if you not sure, ask.