Originally Posted by
christep
You are right in that PEK does seem to be the new airport (only) and BJS the city code (also including Beijing Nanyuan airport, NAY).
Sorry christep, but PEK has been the IATA airport code for a very long time. Well before the opening of the new terminal on the existing PEK airport. PEK is (was) to BJS what CDG or ORY are to PAR, and LHR or LGW are to LON. However, it is true that some airlines use BJS in their ticketing (e.g. KA). A bit confusing indeed.