Originally Posted by goingforgold
It would be interesting to me to hear a more complete explanation - if someone is actually familiar with such subtleties of the NW fare structure!
It doesn't so much have to do with the fare structure as it does contracted discounts, where a P/F fare will get a higher discount than a non P/F fare. So that way an R2P fare wont qualify for the higher discount since it already is deeply discounted from a P26 fare.