Originally Posted by
qfrodo
When you View your reservation on united.com you should see the following in small letters right under the larger United Confirmation Number:
This reservation contains partner flights. View additional confirmation numbers.
Click on the underlined text and it pops up a window containing additional comfirmation numbers. This still works for me when I use TAM, which has left *A.
There are instances, that have happened to me, when that link does not appear. When I do call UA, they can't seem to find the the additional record locators either. It really does happen. As others have said, simply call the other airline, give them your name and the flight number and they will be able to give you their record locator AND make seat assignments (which you need/want to do anyway).
Billy