Boeings have been a popular choice of travel for decades and were once the world’s most popular passenger plane.
Several different models exist, including the 727, 737, 747 and continuing up to the Boeing 787.
They all have one thing in common – their model names start and end with the number seven.
This particular trend dates back to the 1950s when the Boeing 707 was the very first jetliner to be developed by Boeing Commercial Airplanes.
But why do they all begin and end with a seven?
Starting with seven follows the order of other products, according to Simple Flying.
Number 100 was used for early models and biplanes used in the 1920s, meanwhile 200 was designated for single-wing aircraft.
The numbers 300 and 400 were used for commercial propeller-driven planes.
Part of the reason is, starting with seven follows the order of other products, Simple Flying reports
Incidentally, the Boeing 367-80 jet was used as a prototype for the 700s.
Turbo-engine aircraft was designated number 500, and 600 was used for missiles and other military devices.
Number 800 is currently unused and 900 is used for boats.
This left the 700s, which has since been used for Boeing commercial aircraft and consistently ends with seven.
The trend of ending with seven is reportedly a marketing decision, as the model numbers look more attractive in a symmetrical pattern.
Several models have now been discontinued including the 707, 717, 727, 747 and 757.
The most common, Boeing 737, has seen several sub-variants and the newest is the 777X.
Customer codes were also added on the end of the model number between 1956 and 2016 and reference the company that operates the plane, FlightRadar24 reports.
The trend of ending with seven is reportedly a marketing decision, as the model numbers look more attractive in a symmetrical pattern
For example, a Boeing 747-438 refers to a plane operated by Qantas, with the 38 referring to that specific company.
Meanwhile, the number four in the second part refers to the aircraft succeeding other 747 variants.
After decades of developments and new planes, the number 797 is still available and is the last of the sequence.
There have been rumours of what is next to come, but nothing has been confirmed by Boeing.
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The REAL reason why all Boeing planes start and end with seven
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