Exactly what smg77 said. It is not a class of flying per se, more a designator used by MP. Same applies on my statement for recent flights on Mexicana, Ansett and Varig - all show on my MP statment as "K" altho they were of course booked in no such class. Have Air NZ and British Midland showing as Y in same period, so go figger! (And the few UA flights I could not get upgraded on are showing in K as well, otherwise those show simply as C or F, despite being booked in lowball coach.)
We had this discussion last year, and I recall some US based MP members posted their discounted coach showed on MP statements as some other class, so I assumed K was used for non US members. However unless smg77 and Seattle are no longer in the US, this has changed it seems?
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~ Glen ~