How benefits are calculated: Each museum you visit is checked against every network your memberships unlock. You always get the best available benefit. If a museum is excluded in one network (e.g. too close for ASTC's 90-mi rule) but accessible through another (e.g. NARM with only a 15-mi zone), you still get in. AZA reciprocity also depends on your home zoo's tier — a 100% home zoo gets free entry at other 100% zoos but only 50% off at 50% zoos.