Inside Boeing’s Everett assembly plant, the first 777X flight test plane is all but complete. Engineers and mechanics are preparing to roll out this majestic jet for its public debut as early as February. 

• This first plane, a 777-9X model, is 252 feet long. When those 11-footlong tips are unfolded for flight, it has a wingspan of 235 feet. That makes it longer and with a larger wingspan than the latest 747 jumbo jet.
• This first of the new models, the 777-9X, is the larger of two planned versions. It will have three extra rows of seats and carry 400 to 425 passengers.
• While similar in weight to the -300ER, it’s more fuel efficient and flies 250 miles further, giving it an 8,750-mile range.
• Listed for sale at $426 million, the real purchase price of a 777-9X with typical discounts is estimated by aircraft valuation firm Avitas at around $200 million, making it Boeing’s most expensive airplane.
• The 777X will fly for the first time a quarter century after the original 777 model’s debut in 1994.
• Engineers and mechanics are preparing to roll out this majestic jet for its public debut as early as February. It’ll fly for the first time a month or two later.