The first Boeing 737-400 was delivered in 1988. Typical range with 146 passengers 3630km (1960nm).
Airlines that have used the Boeing 737-400 include: Garuda Indonesia, klm, us airways, Olympic airlines, Royal Air Maroc.
By developing the 737-400 as a minimum change stretch of the 737-300, Boeing was also able to offer considerable commonality, and thus cost, benefits to operators already with the 737-300.
A total of 486 Boeing 737-400 have been ordered.
To cope with the increased weights, more powerful CFM56s are fitted. Other changes are minor, such as a tail bumper fitted to protect against over rotation at takeoff, something that could have become a problem due to the increased fuselage length. CFM did no test flights with the new enigine as it was similar to the already certified Boeing 737-300. After a British Midland Boeing 737-400 crashed, it was discovered that there was a problem with the new engines. Vibrations damaged the blades of the turbine.
A higher gross weight longer range version is offered. It features increased fuel capacity, and strengthened undercarriage and structures, but is otherwise identical to the standard 737-400. High gross weight option range with 146 passengers 3850km (2080nm).
The 737-400, was developed as a 150 seat class 727 replacement. Boeing had initially developed the 180 to 200 seat 757 to replace its successful 727.
In 1984 Boeing introduced the 737-300.
In 1987 Boeing introduced a shorter 737-300: the 737-500.
In 1988 the 737-300 was streched (737-400). The 737-400 faced stiff competition from the similar size Airbus A320, which has higher levels of technology, longer range and is faster (but is also heavier).
In 1997 Boeing delivered the first Next Generation Boeing 737.
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