Diversion of topic to airport codes. Doesn't look like these are change-able very easily.

I imagine it must burn up the Chinese no end for Beijing Capital airport to still be 'PEK' and ditto the Indians for Mumbai / BOM.

The Canadians must have been feeling very pure when they agreed for ?all their airports to be in the format Yxx, sometimes with hints of the city involved (YVR - Vancouver), sometimes not (YYZ = Toronto Lester Pearson).