It is amazing to see this 45-year-old DC10 freighter still operating for FedEx regularly:
I know the lifespan of an aircraft is not rated by ages but flight cycles, but an actively used DC10 over 45 years must have exceeded the designed flight cycle right? However, I regularly come across 30+ or even 40+ years old aircraft on FR24 that are still in service, mostly freighter though. Wouldn't they raise any safety concerns? Besides, how could airlines operate them efficiently?