DenizD,
I understand what you are trying to get at but i think it is correct to say that if an airline (Etihad Crystal Cargo) pays for another company (Air Atlanta Icelandic) for the privilege of using their aircraft (A300), then it is correct to say that Etihad C Cargo operates that type. They even state it on their website..
But I must admit I didn't realise the extent of different companies involved with one air cargo company such as gemini air cargo. We learn something new every day!!
David