Entrepreneur Elon Musk, CEO of Tesla and SpaceX, said in February he was close to starting work on a vertical-takeoff-and-landing electric jet as a practical alternative to conventional aircraft. In January, the U.S. Sport Aviation Expo hosted its 12th annual event in Sebring, Florida, and ran into some weather problems. Mooney unveiled the M20V Acclaim Ultra, a significant redesign of the companys best-selling Acclaim, at its Texas headquarters in February. General aviation sales declined 4.6 percent worldwide in 2015 compared to the year before, the General Aviation Manufacturers Association reported in February. The Singapore Airshow, held in February, featured the debut of the 400S Seaplane, by Viking, a Canadian company that has been building Twin Otters for several years.