Sustained human powered flight wasn&#x27;t achieved by top engineering teams until the late 20th century. It can&#x27;t be done without at least aluminum and lightweight plastics.<p>Engine powered flight is much easier and done a century earlier. Yet it still required steel working and internal combustion engine technologies. Small Pacific islands are just not likely to provide access to the necessary iron ore and oil deposits.<p>But I don&#x27;t fault them for trying.