The Boeing 777-200ER is the extended-range version of the original 777-200 and was, for about a decade, the most capable twin-engine widebody in commercial service. It entered service with British Airways in 1997 and was the aircraft that unlocked the ultra-long-haul twin-engine market. United's original flight from Washington Dulles to Beijing launched on the 777-200ER. Singapore Airlines used the type on its original Singapore-Newark flights before the A340-500 took over. The aircraft seats 301 to 400 passengers depending on configuration and has a range of 7,065 nautical miles, enough for most intercontinental routes. Production ended around 2014 as airlines moved to the more efficient 787 and A350, but the 777-200ER remains in service with many major carriers and is expected to fly well into the 2030s.