First off, I'm highly aware that the 737-900ER is already in game, making this variant slightly useless. Though I'd like to emphasize once again, I'm talking about the original 737-900. This specific variant of the 737NG family was originally requested by Alaska Airlines in the late 90s, however it didn't sell well and only saw a few operators before being discontinued and later succeeded by the 737-900ER we all know and love today. I'd like to suggest the non ER 737-900 as it allows IPACS to demonstrate several features found on older NGs on the aerofly fs platform.
Examples include:
No winglets
Cockpit eyebrow windows
Older instruments
Analog standby instruments (such as the horizon, altimeter etc)
Different MCP types (Rockwell Collins/Honeywell)
Dated lights and textures? Dirt perhaps?
In the end of the day, it might not get added into the sim, though I see this variant as a very unique part of the 737NG family that in my opinion deserves a little more attention and respect. Other than that there's the 737-600 (which could allow for a Janet airlines livery and some area 51 flights 👀) but that's a thread for another time.
Whether it gets added or not, I just hope y'all had a good read or laugh at this, hope it made your day too.
Attached below are a couple of example liveries (there's not much, and due to the limit of uploads, I'd like the also recommend Continental's livery but no winglets and eyebrows, gives it a really classic feel)