Join Date: Mar 2015
Location: NYC (Primarily EWR)
Programs: UA 1K / *G, ALL Accor Diamond, IHG Platinum Elite, Marriott Bonvoy Gold, Avis PC, Hertz PC
Posts: 10,566
Saturday, 12/27 has 3 flights with P fares available on SFO-EWR. I find it hard to take whatever any travel agent says to be a true blanket statement.
That said, EWR<->SFO is the highest-revenue flight in UA's system, so finding P fares is undoubtedly harder than it used to be, and the base P fare (now over $1k one way) is not exactly cheap to start with.