Hi. It is possible to work since MFS 2004 without additional modules (FSUIPC etc.). SimConnect is not used for 2004, only for FSX. For 2004, you can use the undocumented software development kit.
A simple example of the module "Landing":
- window version https://www.avsim.su/f/fs2004-utiliti-4 ... 61245.html
- version with hot keys and download to all stations https://www.avsim.su/f/fs2004-utiliti-4 ... 62061.html
- a small video review of the window version https://www.avsim.su/f/raznoe-video-93/ ... 60114.html
In this module, the management is loading stations and effects.