The PDX-PVR flight (seasonal) has the entertainment players available so I assume SEA-SJD is the same, perhaps the FAs decided against renting them due to the stop in LAX. Although the return is more of a hassle when having to go through customs in LAX, I actually prefer the flights with a stop in California....breaks the trip up a little, I can stretch my legs, and of course if it's LAX, visit my favorite BR