The Steam version, called FSX: Steam Edition, automatically provides a valid key and handles the activation process for you. FSX is available for purchase through various online platforms, such as Steam. Make sure to double-check all the contents that came with your purchase.
Typically, you can find it on a sticker or printed directly on the manual or the DVD case.
While I can't provide you with a specific key, I can help guide you on how to locate or acquire one legitimately.
I understand you're looking for the CD key for Microsoft Flight Simulator X (FSX).
