
Originally Posted by
dcutcher
...Worse, my credit card statement has an odd mix ---LAX CHI YTO--of conventional and non- codes. All the more curiously because NO-one conected with any tix I charge uses those #$%^ codes, not aircarrier reservations staff, not airport staff, and certainly not well-seasoned FT-ers.
Sooooo, WHERE do they come from?
(But I don't really
want to know.

)
The fare basis for tickets is usually based on metropolitan area. For fare calculation purposes, what the airline's computer needs to know is CHI. It doesn't care if it's ORD or MDW, so those are converted to CHI before ticketing. Having to store the same fare for every place that can be reached from more than one airport in/near a city would waste space, waste processing time, and create another opportunity for errors. Since your credit card bill shows the end result of fare calculation, the general city codes may show up there. (These codes are not "non-conventional" or "non-standard." They are as conventional as the codes for individual airports, are fully standardized, and refer to a precise list of specific airports - though FTers who don't know this, or aren't anal about it, may not always use them precisely.)
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