Airlines do not make for the most stable investments. The reward can be high, but that's mostly the take when you ride the waves rather than holding the stock through upward and downward movements of the stock price. Copa Holdings S.A. (Dhierin runs the investing group The Aerospace Forum , whose goal is to discover investment opportunities in the aerospace, defense and airline industry. With a background in aerospace engineering, he provides analysis of a complex industry with significant growth prospects, ...