I used to work at a non-UAX carrier, and I would jumpseat home on UA a lot and it was a 50/50 that the CS agent wanted me to have listed on UAL list. The worst part is you can't do it automatically, you have to talk to someone if you are not a UAL/UAX.

Saab, I would list for an international flight. When I worked on the ramp at ORD for ZW a few years back I learned the load planners check the listings 2-3 hours before the flight and pass on the expected total number of passengers to the caterers. That way they can get enough food on the plane. It does not promise you will get the fancy first/business class meal if you get up there, but it does mean you get something.