johnathan68: Often when the supervisors phone is answered, it's by an assistant, or by the assistants supervisor. He/she will indeed answer "yes" to your query "Is that the ATC supervisor?" because that's all they can competently do. If and I stress the if, the real watch supervisor answers, then I for one would be most surprised if you didn't get a full and comprehensive acknowledgement of your "thanks". As a group, we controller's are quite happy to receive a "thank-you" from you people, but the assistants as a group, are not intimately involved, and more often than not, wouldn't understand. Did you see the movie "Lost in translation"?