At least two Swiss teams hold solar world records: Solar Impulse and AtlantikSolar. In 2016, Solar Impulse completed the first ever around-the-world flight in a purely solar-powered airplane. EPFL and Empa were key partners. AtlantikSolar, developed at ETH Zurich, holds the world record for the longest fully solar-powered flight ever (81 hours) of an unmanned aerial vehicle (UAV).