switching a little DAL back into UAL, & looking at LCC
Looking at compare charting, airlines track & take turns catching up/leading long term. So on up air industry days, sell the strongest, & on down days buy the weakest. Google "Mister Market". Mr. Market From Wikipedia, the free encyclopedia Jump to: navigation, search Mr. Market is an allegory created by investor Benjamin Graham. Since its introduction in Graham's 1949 book The Intelligent Investor, it has been cited many times to explain that the stock market tends to fluctuate, and that it is usually best to ignore these fluctuations when determining whether to buy or sell stocks. Graham instead believes that it is important to focus on whether the stock valuation of a company is reasonable after calculating its value through fundamental analysis. Warren Buffett has been quoted numerous times on Graham's 1949 book The Intelligent Investor. Chapter eight covers Mr. Market and Warren Buffett thinks that this is the best part of the book.  Buffett described it as "by far the best book on investing ever written"
1.^ Graham, Benjamin. The Intelligent Investor.
DAL has been leading, so selling down a little DAL on big up days & buying into UAL [on down days] which is lagging, see also relative airline P/S ratios.