How does boeing number there airplanes?

[sachin99]

I thought it would be on size but that's not true because the Boeing 707 is bigger then the Boeing 717. So im curious on how they do number them?
thanks
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[jil_surya]

It was a marketing decision to go to the 7x7 numbering scheme because the 7x7 sounded catchier to the marketing department. See below.

Urban Myths:

Each successive middle digit represents a bigger airframe. Simply not true. The 727 was larger than the original 737, and the 747 is the largest of them all.

The 707 got its name because that is the sine of the 45 degree wing sweep. The only problem is that the 707 doesn't have a 45 degree swept wing; it is 35 degrees.

Billy Boeing is purported to have thought the number 7 to be lucky, thus virtually every model of Boeing made had a 7 in the name. If the company web site is to be believed, also not true. See below.
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[singam]

The system you speak of was first introduced by Boeing in the 1950s with production of the 707. The launch customer of the 707 was Pan Am, and the specific model they had purchased was the 707-120, the initial production version. Thus, the Pan Am aircraft became the 707-121 and Pan Am's numeric designation became 21 (20 represented Boeing itself). The pattern continued with new customers receiving subsequent numbers from 22 to 99. Once 99 had been reached, additional customers received the earlier numbers of 01 to 19. After exhausting the two digit designations, Boeing introduced an alphanumeric system consisting of one letter and one number ranging from A0 to A9, B0 to B9, and so on. This system was also expanded by reversing the order and creating additional codes ranging from 1A to 9A, 1B to 2B, etc. The most recent expansion of the system includes the use of double letters that don't appear to follow any set pattern.
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