Boeing's fifth 777-9X, a production aircraft designated WH286, completed its first flight on Tuesday from Seattle Paine Field International Airport in Everett, Washington.  The flight, lasting nearly two and a half hours, reached 39,000 feet and a speed of Mach .84 (511 knots). This marks Boeing's first 777-9X test flight in five years, following delays due to technical issues. 

Unlike the four prior test aircraft, which have logged over 1,400 flights and 4,000 hours, WH286 lacks testing systems and is designed to evaluate resilience against electromagnetic interference and lightning strikes. "The 777 9 flies beautifully, and this airplane performed as expected," said Captain Ted Grady, Boeing's chief pilot. 

 The 777 9, part of Boeing's widebody family, features foldable wings for better airport access and is powered by the GE9X, one of the largest jet engines ever built. Boeing aims to certify the 777X series this year, with deliveries planned for 2026. The company has secured over 550 orders for the 777X. This flight underscores Boeing's progress toward certification and its commitment to delivering the aircraft to customers.