Oxford (OXF, EGTK) is yet another London airport under the LON city code

Lots more in Europe, though I'm not sure if the link is always formal or de facto (thanks to LCC).


Bangkok (city code and airport code) includes Don Muang (DMK) as well as Suvarnabhumi (BKK);

KUL city code includes KUL and SZB, and SIN has tiny Seletar (XSP)

JKT covers CGK and HLP




Loads more ... (this should bring out the geeks )