Boeing's 777-9 is the world's largest and longest twin-engine commercial aircraft. Once it goes into service, the 251-foot-long aircraft will ferry up to 425 passengers on long-haul flights?spanning up to 7,285 nautical miles?around the world.

The title of the "longest plane" in 2026 depends on whether you measure by fuselage length or wingspan. The longest passenger airliner currently in service is the Boeing 747-8i, which measures 76.3 meters (250 feet) from nose to tail. However, the upcoming Boeing 777-9 (777X), which is entering full-scale service in 2026, surpasses it with a length of 76.7 meters (251 feet), making it the longest commercial jet ever built. If measuring by wingspan, the record-holder is the Stratolaunch "Roc", a twin-fuselage space-launch platform with a wingspan of 117 meters (385 feet)—longer than a professional football field. Historically, the Antonov An-225 was the longest aircraft ever built (84 meters), but following its destruction in 2022, the 777-9 now holds the title for the longest "conventional" aircraft in the 2026 skies. This extreme length allows the 777-9 to carry over 420 passengers in a standard three-class layout while maintaining industry-leading fuel efficiency.