All engine damage, performance, and system failure parameters are saved, as well as many flight configuration items, such as fuel and payload. Beyond that, I may go back some day and implement more complete state saving across all my aircraft, but it's quite difficult with the limitations of working within the simulator's JavaScript context, unlike aircraft with WASM and external software to do the heavy lifting. I'm glad you're enjoying the aircraft, and let me know if there is ever anything else I can do for you!