Originally Posted by emcampbe

Is there a k fare published in the market? As mentioned above, you need both availability in the fare class, which you are saying you see, as well as a published fare in that class. You can have a situation where one is available, but not the other.

If you do have both, you the need to meet the rules of the fare. Things like length of stay, sat. night stay, round-trip requirement, and others can determine whether you meet these rules.