The Boeing 737 is the most sold aircraft in history.
The 737 consists of 4 generations, being:
(1) The original: Boeing 737-100/200/200(Q)C/200F
(2) The classic: Boeing 737-300/300(Q)C/300SF/400/400(Q)C/400SF/500
(3) The next generation (NG): Boeing 737-600/700/700C/700SF/800/800BCF/900/900ER
(4) The MAX: Boeing 737MAX-7/MAX-8/MAX8-200/MAX-9/MAX-10

The 737-200 is the most popular version of the 737-Original with some aircraft still in service today.
The aircraft first entered service in 1968 just 2 months after the 737-100.
The 737-200(Q)C was a variant of the 737-200, which could be converted forum passenger to freight operations, it could also be used in a combi configuration.
Some of these aircraft are still in use today, for example in Canada; where Nolinor operates a more than 50 years old 737.

I have also made the other aircraft from the 737 family.
737-Original:

737-100

737-200

737-200F

737-Classic:

737-300

737-300(Q)C

737-300SF

737-400

737-400(Q)C

737-400SF

737-500

737-NG:

737-600

737-700

737-700C

737-700F

737-800

737-800BCF

737-900

737-900ER

737MAX:

737MAX-7

737MAX-8

737MAX-8-200

737MAX-9

737MAX-10

Controls:
AG2 + Brake for reverse

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