...frequent flyer miles asap. According to this article, the airline industry is in major catastrophe mode. Interestingly, the article is not from some crazy outside source but from an industry trade publication.
Pay careful attention to the date of the article.
It was published in 2005 when oil was $60 a barrel--and almost all of the article's short-term predictions are proving accurate.
Train travel, anyone?
More on the topic, here and here.