In 2020, Natilus's huge unmanned planes could carry 200,000 pounds of goods across the world. But first, a 30-foot prototype must pass test runs. In 2020, Natilus's huge unmanned planes could carry 200,000 pounds of goods across the world. But first, a 30-foot prototype must pass test runs.Commercial passenger jets fly at an altitude of around 30,000 feet or higher.