I don’t have an answer to your question, but it is an excellent one.
Generally, I can transfer from my wheelchair to the on board chair (even if it does seem a little small for the size of my a*se), but the kind of ‘help’ the airport staff attempt to give when transferring into the plane seat, or indeed to and from my wheelchair, is terrible. They have a tendency to pull on my arms, fail to communicate what they are about to do, treat me like I’m a sack of potatoes, etc, etc.
So, while I have no need of a hoist at present, I have had several awkward, painful, embarrassing times on planes. My default mode now is to launch straight into antagonistic, severe tones as I tell them “this is what I want you to do”, “no, don’t pull my arm”, “I will do this” and “please do that”. All said in a schoolmarmish tone to ensure they get the message.
I don’t think their training is terribly good, but I have to say, it seems to matter very little whether they are ground crew or on board crew. To find someone who actually knows how to assist a disabled passenger is difficult to say the least. Maybe we should be flying to Norway.