I dont think international is any different. Last week, I went right to an Airways ticket counter and told the lady I wanted to buy a ZED fare for my "domestic partner" (as my girlfriend is known to them) from ABC to XYZ. They work their magic on the computer, you pay, and they print you the ZED. Then you take it to the airline's gate your using to travel from ABC to XYZ and present it (after you listed on them). They'll take care of the rest. I don't know the req's for how long you have to be with your company.