You are correct that private jets are often owned by organizations including trusts in order to obscure their true ownership, but many of the jets on this site

You are correct that private jets are often owned by organizations including trusts in order to obscure their true ownership, but many of the jets on this site that are labeled as being owned by 'something something Trustee' are in fact commercial airliners owned and operated by major airlines, which seems to be pretty common. Here are some that I found in just a few seconds of clicking planes in the air over my own state on ADS-B Exchange: https://flightaware.com/resources/registration/N338DN https://flightaware.com/resources/registration/N338DN https://flightaware.com/resources/registration/N330DX https://flightaware.com/resources/registration/N330DX https://flightaware.com/resources/registration/N356FR https://flightaware.com/resources/registration/N356FR https://flightaware.com/resources/registration/N324DX https://flightaware.com/resources/registration/N324DX