[aravenel]

Yes, but for many flights, especially international ones, the charge for those seats is not worth it.

I was looking into flights to Japan, and the Premium Economy tickets are literally double the regular economy tickets.

Many domestic flights have Premium Economy for less than double the price, but it's still expensive enough and the benefits not great enough (generally only a couple of inches of legroom--no change in seat width, no better service, etc) to generally not be worth it unless you are flying cross country.