Wait. I missed that entirely. Whatever does @PDPrice know about dinosaur lungs? I don’t know of any case of preserved dinosaur lungs*, certainly not in enough detail to determine the direction of air flow. However, we do know that plenty of dinosaurs had hollow bones, presumably with air sacs, a feature of avian unitary flow. Even better, there are all manner of intermediate fossils connecting modern birds to the earliest dinosaurs. And the feathers, of course. Archaeopteryx alone kills creationist nonsense.
.* Scipionyx has been claimed, but I don’t think so.