United Airlines on June 1 plans to begin flying nonstop from San Francisco to Singapore, pending regulatory approval.

The service would become the longest nonstop route offered by any U.S. carrier, United said, and the lone nonstop flight between the U.S. and Singapore.

United will use a Boeing 787-9 Dreamliner to cover the 8,446-mile-route.

"This long-awaited service has been made possible by the newest version of our customer-pleasing Boeing 787 Dreamliner, and will offer unique benefits to customers traveling between our West Coast hub at San Francisco and Singapore," said Marcel Fuchs, United's vice president of Atlantic and Pacific sales.

Last October, Singapore Airlines said that it plans to resume nonstop service to the New York area and to Los Angeles in 2018. The carrier discontinued routes from Singapore to LAX and Newark in 2013. It will fly the routes again once it takes delivery of Airbus A350-900ULRs aircraft.

At 9,500 miles, the airline's Newark-Singapore route was the longest in the world.

United's San Francisco-Singapore flight will have 252 seats, including 48 in business class and 88 in Economy Plus. It will overtake Delta's Atlanta-Johannesburg flight as the longest offered by a U.S. airline, according to USA Today. Once it begins the service, United will discontinue its flight between Tokyo and Singapore.

The longest existing regularly scheduled plane service is Qantas' 8,578-mile flight from Dallas to Sydney, which takes 17 hours. Emirates will best that in February with the commencement of Dubai-Panama City service.

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