The 777X made its first flight over Washington state at 10:09 am local time and landed at 2:00 pm outside Seattle. Previously, the company had to put off two earlier attempts due to high winds.
The company published several tweets on the details of the flight.
Earlier in the day, Boeing officials said, as quoted by Reuters, that the maiden flight would continue 3-5 hours and then the model would be tested for months before the jetliner enters service with Emirates in 2021.
“To me, this is the flagship for the big airlines around the world ... it represents the great things we can do as a company”, 777X marketing director Wendy Sowers added.
According to information on the company's website, the new Boeing 777X is expected to be the world’s largest and most efficient twin-engine jet, which will deliver 10 percent lower fuel use and emissions and 10 percent lower operating costs than the competition.
The Boeing 777X has new GE9X engines, as well as greater cabin width and new composite wings. The aircraft was designed to hold 400 people, on average.
The company has said that 309 of the aircraft, worth more than $442 million each, were already purchased.