What happened 20 September in United States of America

On September 20, 1904, Wilbur flew the first complete circle in history by a manned heavier-than-air powered machine, covering 4,080 feet (1,244 m) in about a minute and a half.

The crew assignments for Gemini 8 were announced on September 20, 1965. Under the normal rotation system, the backup crew for one mission became the prime crew for the third mission after, but Slayton designated David Scott as the pilot of Gemini 8. Scott was the first member of the third group of astronauts, whose selection was announced on October 18, 1963, to receive a prime crew assignment.

Hepburn appeared in Two for the Road, a non-linear and innovative British dramedy that traces the course of a couple's troubled marriage. Director Stanley Donen said that Hepburn was more free and happy than he had ever seen her, and he credited that to co-star Albert Finney.

The Macintosh Portable is a portable computer designed, manufactured and sold by Apple Computer, Inc. from September 1989 to October 1991.

The Rock 'n' Sock Connection won back from Undertaker and Big Show on the September 20, 1999 episode of Raw is War.

On September 20, 2001, President George W. Bush addressed the nation and a joint session of the United States Congress regarding the events of September 11 and the subsequent nine days of rescue and recovery efforts, and described his intended response to the attacks. New York City mayor Rudy Giuliani's highly visible role won him high praise in New York and nationally.

In 2016, with the release of macOS 10.12 Sierra, the name was changed from OS X to macOS to streamline it with the branding of Apple's other primary operating systems: iOS, watchOS, and tvOS. macOS 10.12 Sierra's main features are the introduction of Siri to macOS, Optimized Storage, improvements to included applications, and greater integration with Apple's iPhone and Apple Watch. The Apple File System (APFS) was announced at the Apple Worldwide Developers Conference in 2016 as a replacement for HFS+, a highly criticized file system.