FlyerTalk Forums - View Single Post - Fare code glitch, Z and A swapped- does the fare not exist?
Old Sep 26, 2011 | 5:40 pm
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ijgordon
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It looks like CO is changing their fare class structure after October 1st -- paid domestic first class will book into F or A, whereas now it could book into F, C, D or Z.

It could be related to this, though how exactly I'm not sure.
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