Variants

Planform view of an Air France Boeing 777-200ER in flight

Boeing uses two characteristics, fuselage length and range, to define their 777 models.^[16] Fuselage length affects the number of passengers and amount of cargo that can be carried; the 777-200 and derivatives are the base size, and the aircraft was stretched into the 777-300 in 1998. In terms of range, the aircraft has been categorized into three segments based on design criteria; these were initially defined as the following.

• A-market: up to 4,200 nautical miles (7,800 km)^[137]
• B-market: 6,600 nautical miles (12,200 km)^[137]
• C-market: 7,800 nautical miles (14,400 km)^[138]

When referring to different variants, Boeing and airlines often collapse the model number (777) and the variant designator (−200 or −300) into a truncated form (e.g. "772" or "773"^[139]). The International Civil Aviation Organization (ICAO) aircraft type designator system adds a preceding manufacturer letter (e.g. "B772" or "B773").^[140] Subsequent to the capacity number, designations may or may not append the range identifier (e.g. 777-300ER as "773ER",^[141] "773B",^[142] "77W",^[143] or "B77W"^[140]). These notations may be found in aircraft manuals or airline timetables.

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