The Aerosoft CRJ 700/900 X has been released for FSX(SP2), FSX: Steam Edition or Lockheed Martin Prepar3D V3/V4.
The boxed version will come out 28 September 2017 but you can get the download version now (as far as I know)
You can get more info at this link should you be interested.
http://www.aerosoft.com/en/fsxp3d/pre-o ... ble+now%21