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 737-900ER has proven to be a way more popular aircraft with airlines than the 737-900.
The 737-900’s capacity problem was fixed by adding two type II mid cabin exits, if an airline configured the aircraft with more than 189 seats.
However, some airlines didn’t configure the aircraft with more than 189 seats, on these aircraft, the type II exits are deactivated and replaced with door plugs.

This aircraft has the type II exits deactivated.

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

737-100

737-200

737-200(Q)C

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

737-800C

737-800BCF

737-900

737-900ER (With Type II Exit)

E-7 Wedgetail

P-8 Poseidon

737MAX:

737MAX-7

737MAX-8

737MAX-8-200

737MAX-9

737MAX-9 (With Type II Exit)

737MAX-10

Controls:
AG2 + Brake for reverse

Please upvote if you like the build