Historically, Eagle Dynamics provided more activations if you ran out, but as the product is now "Legacy," support is limited. Where to Find Your Key

If you want, I can provide:

Because FC3 exists, Eagle Dynamics no longer actively supports or sells activation keys for the standalone FC2. This has rendered most retail keys obsolete.

While Lock On: Flaming Cliffs 2 (FC2) remains a nostalgic favorite for flight sim enthusiasts, its legacy activation system can be a bit of a headache on modern systems. If you’re looking to get back into the cockpit, here is everything you need to know about the and how to manage the StarForce DRM today. The Basics of the Flaming Cliffs 2 Key