This post is hopefully going to cover everything in the community has said. So let's first start with Aircraft.
(Airliners) A330-300/A330-900, A321N, A220, A340-300/A340-600, A350-900 ( I dont actually think we need it), A300, and A310. Thats for Airbus but now Boeing. 707, 717, 727, I would actually like personally if yall would ever add the 737-200, 737 Max 8, also like the 737 id like the -200 and -8 added if ever possible. Continuing, the 757-200, 777-200ER/LR has been requested.
Getting into smaller/regional aircraft - ATR 72/42, Embaer 175, 195-E2, CRJ-200.
GA aviation - Any Gulfstream jets, maybe a phenom 300.
Other Airplanes, B1 Lancer (I dont think yall would do), B2, B25, F22, F16, F14 and Blackbird.
Starting Game Improvements, people have recommended - Sky, Weather (Rain, Windshear ETC). Landing effects (such as smoke) and id like to see if we land hard enough there could be a potential backfire or engine failure. Going on with more people have mentioned is Failures, such as Gear, Engines, Hydraulic, Flaps.
I think the most important thing if yall do eventually add regional airplanes to the game is do a major global airport rework.
I may speak here about American mainly but most airports aren't 3D, some without papi lights, such as KIAH or KDFW. Also some airports with yalls generative airport thing has kinda left some on ground tarmac gone, like at some gates at KIAH there is peices of tarmac completely gone.
I know there are other locations that are deprived just as much, thats why I mentioned global scenery and not just US airports, like African airports such as Johannesburg or Cape Town.
Real time and real weather, live METAR. This would be huge!
Simbreif, flight trackers - Straight forward, it would be better for flight planning.
Mulitplayer - I know this would be extremely complex and difficult to add.
Fuel state - Loss of fuel over duration of flight (such as the Cessna 172 has), I know this has been a huge topic recently in the community and I have to add it.
Ground Handling - Auto pushback, cargo, etc
As an Aerofly user as myself I am grateful for what IPACS has given us and I think we should all be too! Now im not trying to make more posts I was trying to sum up alot of the chats in one post. (This was probably useless and will probably be deleted)
Anyways thanks for viewing!