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Hi
It's a Boeing 737-400 Combi with my fictional airline.
Another variants at bottom description or comment.

Credit & Mention:

@realSavageMan for interior cockpit (unfinished)
@XAircraftManufacturer for engine from XJ737-300, I modify it to look semi accurate.

B737 Classic:

The Boeing 737 Classic is a series of narrow-body airliners produced by Boeing Commercial Airplanes, the second generation of the Boeing 737 series of aircraft. Development began in 1979 and the first variant, the 737-300, first flew in February 1984 and entered service that December. The stretched 737-400 first flew in February 1988 and entered service later that year. The shortest variant, the 737-500, first flew in June 1989 and entered service in 1990.

The 737-400SF (Special Freighter) is a 737-400 that has been converted to haul cargo. Alaska Airlines was the first to convert one of their 400s from regular service to an aircraft with the ability to handle 10 pallets.[14] The airline has also converted five more into fixed combi aircraft for half passenger and freight. These 737-400 Combi aircraft were retired in 2017 and replaced with 737-700Fs.[15] In November 2018, VX Capital launched an ABS secured on 35 737-400 freighters valued at $250 million (an average of $7.1 million), to be leased for $100,000 per month each.

CONTROL & ACTIVATION GROUPS:

VTOL - Flaps
Trim - Trim
Ag1 - Strobe, Landing Lights, Beacon
Ag2 - Reverser and pushback
Ag3 with Brake - Spoiler/SpeedBrake
Ag4 - Cabin Lights
Ag5 - Freight door
Ag8 - Engines and Nav Lights

Variants:

Generic 737-400C
B737-300
B737-300F
B737-400
B737-400F
B737-500
For Details/more 737 click here

Have fun!