Oh! awesome that you replied! Now we know why they cant do it. It has to do with the weight and lung placement!Makes sense on why I couldnt find anything air sac related!When my goose had surgery the vets made sure she wasn't lying on her back. The vets said that the weight of her chest could suffocate her. A goose's lungs are located nearer its back than its chest. My two vets have a combined 70(!) years of experience between them and both take special interest in birds, so I guess they know what they're talking about.
I don't know if this applies to healthy geese not put under anesthesia, but I wouldn't chance it.