Indeed it is. Along with gibbons, orangutans of both species can be mixed with tapirs, otters, and other primate species.
It is a relatively new innovation in the United States at least it seems like. Not many places do it. Oregon Zoo has its orangs mixed with white-cheeked gibbons. San Diego and Fresno have their orangs and siamangs together. Are there any other zoos in the U.S. that mix their orangs with other species? I am not aware of any.
The mixing of orangs with other species is much more common in European zoos but there are a number of USA zoos that have in the recent past or even at this very moment contain mixed-species exhibits featuring orangutans. The first 7 zoos on this list have orangs with a species of gibbon: Oregon San Diego Fresno Chaffee Cincinnati Miami Metro Richmond Omaha Orangs with turtles: Houston (with Malaysian Giant Turtles and Yellow-Headed Temple Turtles)
Depending on the rotation, Louisville occasionally has fruit bats with them, at least while I lived there.
The only way I could see that happening is if there were bats in the indoor Day Room, however, fruit bats can only be found in the early part of the Pavilion building.
I thought the orangutans could rotate into that exhibit. My apologies if not, it's been quite a while.