Unless you can get one ticket that works for all three facilities, then I don't see any way that someone can consider them to be the same. Nobody is denying they are owned by the same organization, but that does not mean they are one and the same. It'd be like arguing that Disneyland and Disney World are collectively one theme park because Disney owns both of them- you'd be laughed out of the room with that argument. What makes the Audubon Zoo and Audubon Aquarium of Americas any different? Same ownership, but two different facilities marketed as such. Omaha is not like that because the aquarium is inside the zoo, and included one and the same, advertised as such. Note that despite often hearing "Omaha's Henry Doorly Zoo and Aquarium" or "Pittsburgh Zoo and PPG Aquarium" or "Columbus Zoo and Aquarium", I have not once heard anyone say "Audubon Zoo and Aquarium", because they are not one and the same, are not marketed as such, and should not be considered as such.