Originally Posted by aaupgrade
A fare is also a YUP which from the OP's comments is what the final leg should have been.
I thought that was now a P fare, which thought used to be a F fare on a 3 class flight...but this alphabet soup is certainly confusing. Actually I thought the KUP = K/YUP = P.
I did just travel on a KUP -> P, and have an UG booked into A...