Delta Air Lines raised guidance on next week’s earnings report, which sent shares of all major U.S. airlines higher. Bill Mann analyzes the rationale for the ripple effect and shares the one airline stock he owns. (Hint: It’s not in the U.S.) We discuss Lyft’s suddenly-challenged stock price and the potential effect on Uber’s upcoming IPO.  Plus, we dip into the Fool Mailbag to talk about cash, as well as our April Fool’s Day episode.