Try the other 2 email addresses in my previous post.
It is possible that Walter has not even read your email. Unfortunately you'll have to be patient with these people as they are not exactly what you would call expeditious. I prefer to use the term, lazy.
In the meantime what you can do to prepare for a career as a Copa pilot is to sit in the most uncomfortable chair in your house staring at a computer screen for approximately 7.5 hours at least 23 days each month. Also, try to do this between the hours of midnight and 0800 for added realism. Make sure that you eat a very small portion of microwaved chicken or beef and a small piece of bread while sitting. When you are finished with the month, have someone hand you a few dollars and then smack the hell out of you.
Welcome to Copa!