The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Boeing[2] says only 2027. Lufthansa, the launch customer, has delivery “currently scheduled for mid-2027” per Lufthansa Aviation Training, so the pin sits at the middle of the year.
Boeing's 777X page lists the 777-9 at 375-450 seats, "Up to 8,000 nmi", 76.7 m long with a 71.8 m wingspan folding to 64.8 m, and claims "20% lower fuel use and emissions".
Wikipedia's Boeing[2] 777X article describes GE9X engines, "composite wings with folding wingtips", the January 25, 2020 first flight and 110,000 lbf thrust per engine.
Covers the 2027 entry into service and the delay's cost.[1]
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