An update for those who are interested:
Back in December/January, I wrote to a number of Animal Kingdom zookeepers and vets whose email addresses were publicly available online. None of them responded.
In early February, I sent a message to the generic Guest Services email address, knowing it would take them some time to come back with an answer. After I phoned last week to check the status of my enquiry, they finally wrote to me earlier today. I had asked two questions: first, whether the lappet-faced vulture at the foot of the Tree of Life had been pinioned (as discussed in the first post of this thread); and second, where AK's flight-restriction policies stood more generally, especially in light of the AZA's recommendation that pinioning be phased out. My first question also referred to (and asked about) the vulture's offspring, which a CM told me had recently hatched in the park.
The reply to my first question was as follows:
"Specifically, our lappet-faced vultures came to us as a rescue after being injured in the wild. Because of this, they’re now reliant on human care and have been flight restricted since they’re unable to be released back into the wild."
This didn't tell me whether the vultures had been pinioned, and it also implied that all of the vultures were rescues, which isn't the case for the chicks that were bred at AK itself. Since my question asked directly whether these birds had been pinioned, I can only assume that the avoidance of a straightforward answer constitutes a yes.
As for my second question, the reply was even less satisfactory:
"As an Association of Zoos & Aquariums (AZA)-accredited facility, we work closely with the organization to examine current and future animal care and management practices. We also have a strong focus on overall animal care and welfare and play a leadership role in many AZA programs."
Generic boilerplate, with nothing at all about pinioning or flight-restriction policies. Again, the logical inference is that they practise pinioning and don't want to say so in writing.
I'm disappointed but not really surprised by these vague and evasive answers. I'm still weighing up whether it's worth pushing for more details.