This is more a “related information” post than an answer per se, but it seems potentially useful enough for those interested in digging to be worth posting as an answer:
There is a wealth of information here – Travelocity – FARE RULES – not explanatory per se, but notes on fare rules written for use (it seems) by somebody familiar with the “jargon” involved. A number of extra codes are mentioned. Gives insight into practices, traps, … .
This is specific to one route – see below. But other material may be turned up by searching, based on the page’s content. They say:
They are not standard codes actually, sometimes they are similar but not always.
NONREF
: Non-refundable.0VALUAFTDPT
: 0 value after scheduled departure. If you want to make any change make it before the departure time or the ticket has no value at all.CHGFEE
: There is a change fee in case you want to change times.Credit:stackoverflow.com‘
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