I ended up with Copa Airlines
After the trouble with the credit cards and Avianca, I read further and there are many customers complaining about Avianca. Plus the credit card representative said that they were having multiple problems with Avianca which was why the did not let the charge go through. My only experience with Avianca was ten years ago when I flew from Sao Paulo to Bogota. It was an excellent flight. The bankruptcy probably did them in.
Copa Airlines has been very reliable in the past. It seems as if they are always on time. But the difference in price between Avianca and Copa probably would have paid for all my Medellin adventures since I like to fly business class. Oh well. I am old. You can't spend it after you're turned into ashes.