Which, if any, of the FF programs allow an open-jaw award to/from different destinations? For example, US to the South Pacific, returning from South America for 1/2 of the miles required for the outbound award plus 1/2 of the miles required for the return. This situation comes up sometimes when my parents plan cruises. They always end up buying the air from the cruise line at exhorbitant prices and without any way to predictably upgrade with miles.