PAX aren't always thick or wrong though. On one occasion, I was travelling from Dayton Ohio to Stockholm Arlanda via Chicago and London Heathrow. The lady at check in was quite firm in her conviction that the bag should be tagged to STO for Stockholm. STO is Stockholm Metropolitan and it took a lot of arguing before she would tag it to ARN. As you can't fly to STO from LHR, I wonder just how long it would have taken for the bag to join me....