I am on flight UA906 from ORD to MUC in a Boeing 767-300 and inquired with the cockpit crew if there was a possibility for me to operate /aeronautical mobile.
I had read about operating /aeronautical mobile on various blogs, but reports were for the most part not with a current date.
Both the pilot as well as co-pilot were very receptive to the idea, and informed that I could very well listen in to one of the cockpit radios from one of the cabin phones as they had the technical capability to do this, but informed me that they had no technical possibility of switching transmit control from the cockpit of a 767-300 to one of the cabin phones.
They did however encourage me to inquire with the cockpit crews of other airplane makes and models, as these may indeed have such technical capabilities.
I would appreciate feedback if any HAM were to identify such an airplane make & model.