Unique, fixed customer codes were used by Boeing Commercial Airplanes to denote the original customer for airframes produced as part of Boeing's 377 Stratocruiser and later 7x7 families of commercial aircraft until 2016.
In 2016, Boeing announced that they would no longer apply customer codes to any aircraft produced after a certain point, which would lead to their designators being the "generic" type for the model. The codes were removed from the type certificates for each model with effect from the production line number shown below:
Furthermore, customer codes have never been used for Boeing airplane models launched after the termination of customer codes, namely the 787, 737 MAX and 777X.
Format
The codes are in the form of two letters and/or digits which are appended to the aircraft's model designator, as seen in the following examples:
A Boeing 767-300ER ordered by GECAS with customer code 6N would be designated as Boeing 767-36N(ER).
A Boeing 777-200LR, 777-300, 777-300ER & 777F ordered by Emirates with customer code 1H would be designated as Boeing 777-21H(LR), Boeing 777-31H, Boeing 777-31H(ER) and 777-F1H (not 777-21H(F)) respectively.
The codes do not change if the aircraft is subsequently sold, such as if a passenger aircraft is owned and operated by another airline or converted into a freighter. Several examples are several 777-300s originally built for Emirates with customer code 1H and subsequently sold to Cathay Pacific are still designated at 777-31H, and a Boeing Dreamlifter that was originally built as a 747-400 passenger aircraft for China Airlines with customer code 09 subsequently sold to will be designated as 747-409(LCF) (instead of the original 747-409).
Exceptions existed, such as in some cases if an airline cancelled or sold their order before Boeing had commenced building the airframe, the customer code would be changed to that of the new purchaser. One such example is the order for sixteen 737-800s taken over by Qantas from American Airlines after the September 11 attacks in 2001 - these aircraft were delivered with Qantas' 38 code rather than 23 for American. Also, 2 747-200Bs purchased by British Airways were sold while under construction, to Malaysian Airline System and remained 747-236Bs. Another case is a situation where Boeing sells experimental aircraft to an airline, one example being the first two 777-300ERs built initially as experimental aircraft for Boeing which were subsequently sold to Japan Airlines had their codes changed from 777-300(ER) to 777-346(ER).
List of Stratocruiser customer codes
Customer codes used for the 377 Stratocruiser did not carry over into the 7x7 series.[1]
Boeing generally allocated new codes in sequence, with the exception of 01 to 19 being issued after 21 to 99. Code number 20 itself came to be reserved for Boeing's own use, though this was only ever formally the case for the 707.
Please note that the list of aircraft types for each airline is only those produced with that of the airline's code, and is not intended to reflect their complete operational history.
^As with all Stratocruiser customer codes, 26 was reassigned to another customer (in this case the United States Air Force) with the introduction of the 7x7 family.
^Early 727s followed the "727-XX" format (alternatively "727-0XX") as they did not have a variant suffix. With the introduction of the stretched 727-200, the original 727 was redesignated as 727-100 and all subsequent short-bodied aircraft followed the "727-1XX" format.
^Customer code 20 was assigned to only a single company-owned 707 demonstrator. However, Boeing often referred to different variants of the 707 and 720 using the customer code in marketing material, regardless of whether any individual aircraft carried it.
^Customer code 00 was assigned only to company-owned aircraft, such as prototypes and demonstrators. However, Boeing often used the customer code in marketing material, regardless of whether any individual aircraft carried it. After customer codes were dropped in 2017, some new aircraft continued to carry model numbers ending in "00", but these are left out of this table as they are not customer codes.