As holiday travel is at its peak and as so many are already planning their vacations for next year, I think it's time we address the age old question of, "When should I purchase my airfare?" Bloggers and travel writers have filled cyberspace with all sorts of theories and schemes related to when a person should be purchasing airfare for their next trip. But what we have determined is that most of these theories and schemes are nothing more than that...theories, conjured up s