GAIA is a powerful worldwide alliance of more than 650 grassroots groups, non-governmental organizations, and individuals in over 90 countries. (insteading.com)
Alaska Airlines doesn't belong to a major worldwide alliance but it has built up a good range of airline partners with whom you can use Alaska Miles. (travelingformiles.com)
Delta and Virgin Atlantic may not be part of the same worldwide alliance but they've been very strongly connected ever since Delta took a 49 % stake in Virgin Atlantic back in 2013. (travelingformiles.com)