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This number indicates specific airframe, incl all optionsselected by an individual customer. Mostly a number-block is reserved for expected additional orders by the same customer. The larger the customer the more numbers are blocked in advance. If the block is full (more aircraft ordered , than initially expected), a second block is used.

First letter gives the aircraft type

P = 737, Y = 737NG, R = 747, N = 757, V = 767, W = 777, Z = 787.

The second letter stands for the minor model or a further sub-division . This is the variable (effectivity) block and the three following numbers are the sequence within the block. Note that not all numbers within a variable block actually get built.

Examples :

RA001 the first built 747-121 for Boeing.

RA002 and further is used to identify the PanAm configuration (airline specific options)

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Q: What is the meaning of a variable number in a Boeing aircraft?
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