Interesting data set. I think you're right that our different travel patterns probably have a large amount to do with it, but I think even the data set you provided has something for both of us.

The P fare there is much more in line with what I would expect from a "discounted" J, if it's available. But even Z fares are a huge jump up from that, so depending on how many P fares are offered, it may or may not be available.

Do you find P fares like that to be pretty commonly available on the routes you're on? It's quite possible that on the routes I'm flying, P fares may be similarly priced, but usually what's available in business lowest seems to be Z fares, at a meaningful premium to Flex and often more than Latitude.