If I were the airline, I would bestow 3x credit for full F, given what full F costs. Of course, if I were the airline, anybody paying full F would get picked up from home/office and taken to the airport for free. That's how high the yield is on those fares.

The converse of this is that I am surprised that the A fares still garner such full benefits, since many of them are far less than full Y has been traditionally.

This is just another example of where the legacy carriers don't get it. In many ways, the fact that they don't get it helps us (i.e., full F credit for A fares), but still I would like to see at least a few carriers make it through the next five years intact and (gasp!) strong, so I wish some of them would figure things out.

And, in my mind, people are willing/happy to pay for what they got when they got what they thought they paid for (e.g., Southwest), but they grow increasingly resentful when they don't get what they thought (remember, perception equals reality) they were paying for.