Have you tried creating a listing on AA for your grandparents? When I log in to TravelUS from jetnet, the avail guest pass number is 0 even though I have successfully listed for and traveled on US flights. It is my understanding that your grandparents (retiree+spouse) are eligible for unlimited travel on AA. As retirees, they do not use buddy passes but if you or another family member or friend wish to travel, you can only do so on US Airways until the systems are merged. Likewise, AA employees cannot travel with buddy pass travelers at the present time on US. After October 7, the reservation systems are supposed to merge. Hope this helps!