Originally Posted by samuelmehr

If I remember correctly, P is the class in which I was able to find ludicrously cheap tickets in the domestic US in the past, especially for short flights. Sometimes only 20-30% more $ than a Y fare, but double or triple the SP earn. But I only did this maybe 3-4 times and it was a year or two ago, so not sure if the deals are as good anymore (or maybe I lucked out those times, who knows).