Originally Posted by
Shoebox
What makes you assume all supervisors are not Chinese?
Some of them are most likely Chinese who speak with a more western accent (those who studied or grew up overseas who don't have a local accent). People can't tell if a person is Asian just by listening on the radio. I think when he said "non-local", it's not really meant to be ethnic specific, it's more towards the controller's language background or accent. A person can be "non-local Chinese" as well.