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Unique, fixed Boeing customer codes have been used by Boeing Commercial Airplanes to identify the original customer for an aircraft for all Boeing 7x7 aircraft, up to and including the Boeing 777. The codes were announced at an ICAO congress in 1956. Customer codes are not being used for the Boeing 787 Dreamliner. An example would be a Boeing 747-400 ordered by British Airways would be a Boeing 747-436 (36 being the customer code). The codes do not change if the aircraft is subsequently sold as they reflect the original configuration of the aircraft. Before the 707, Boeing used a generally similar system to identify the presence of detailed variations or options requested by particular customers, but the codes were not customer-specific. A Boeing 377 Stratocruiser built to the requirements of United Air Lines, for instance, was designated a Model 377-10-34. In the 7x7 series, the code denoting United Airlines is 22, so a 747-400 built for United Airlines is a 747-422. ==List== The order of codes has not been sequential, as the first 707 was designated the 707-120 by Boeing, so the customer codes started at 21: *21 to 99 - First Sequence *01 to 19 - Second Sequence *A0 to Z9 - Third Sequence *0A to 9Z - Fourth Sequence *AA to ZZ - Fifth and current sequence Airlines in ''italics'' are defunct. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Boeing customer codes」の詳細全文を読む スポンサード リンク
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