When finalized and posted on Boeing's Orders & Deliveries website, Korean Air will be the latest customer to purchase the world's largest and most fuel-efficient twin-engine jet.

The 777-9 can seat 426 passengers in a two-class configuration with a range of 13,500 km (7,285 nautical miles), while the 787-10 can carry up to 336 passengers with a range of 11,730 km (6,330 nautical miles).

"We are honored Korean Air has selected our largest, most efficient widebody airplanes to add capacity to its global network," said Stephanie Pope, president and CEO of Boeing Commercial Airplanes. "Boeing airplanes have played an integral role with Korean Air over the past 50 years, and the 777X and 787 Dreamliner will continue to support the airline's long-term goals for sustainability and continued growth."

The 777-9 features advanced technologies from the 787 Dreamliner family, including new carbon-fiber composite wings and engines that enable it to achieve better fuel efficiency by approximately ten percent compared to competitors. Meanwhile, the fuel efficiency of the 787 has helped operators avoid more than 169 billion pounds in CO2 emissions since entering service.

Korean Air continues optimizing its global route network aiming to maintain its status as a leading global carrier. The airline plans new business class suites and Wi-Fi capability onboard its new 787-10s, further enhancing its award-winning onboard service.

Korean Air's Aerospace Division currently supplies components for the 787 program, including unique raked wing-tips. The supplier also produces parts for several Boeing airplanes including the 737 MAX, 767, and other models in the Boeing lineup.