Based on the information provided, the investment in Dubai Establishment by Utah and the other investors indicates a collaborative arrangement where all investors have significant influence but no single investor controls the entity. Given the shared use of the fleet of ships and the shared obligations and benefits related to the fleet, as well as the detailed agreement among all investors, this scenario suggests a joint operation or joint venture structure. However, since the term "joint venture" is often used to describe a specific type of joint operation where the parties have agreed to collaborate for a particular project or business objective, which seems to be the case here with the shared use of the shipping fleet.

Therefore, this investment should be classified as: A joint venture