What medryn says about Portland embracing its airport code is frighteningly true, but there's more—its use stretches well outside of the airport and can be used to refer to the city as a whole. Just the other day, I was talking to P_I about the Horny E2 Portland Conflagration, and confused him by using "Portland" and "PDX" interchangeably. I explained to him that we referred to the city by its airport code, and he replied, "We here in YVR don't do that." Yet another tidbit contributing to the ever-increasing mass of evidence of the utterly bizarre insanity of us Portlanders.