A Twin Otter in 2006 (IMAGE) U.S. National Science Foundation Caption This shows a Twin Otter aircraft at NSF's Amundsen-Scott South Pole Station is shown in a 2006 photograph. Credit Spencer Klein, NSF Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.