The many uses of light aircraft include aerial surveying, such as monitoring pipelines. They are also used for light cargo operations, such as "feeding" cargo hubs, as well as some passenger operations. Light aircraft are also used for marketing purposes, such as banner towing and skywriting. Primary flight instruction is also conducted in light aircraft. Finally, most personal aircraft are light aircraft, the most popular being the Cessna 172. Larger light aircraft, such as twin turboprops and very light jets are often used as business aircraft.