The two easiest ways are to ask, and to have Google as your friend. For example, when somebody says they are flying through yyr or something I'll just google yyr to see where that is (airport yyr as the search) and it will tell me that is goose bay airport in Canada.

(no, I didn't know that, I made up three letters and googled it)

One of the good things about this forum, actually two of the good things, is that most people are more then willing to help, and they don't get carried away with secret codes.

Welcome.