A few days ago, I wrote an article about Delta Air Lines ( DAL ) and what smart money is doing to prepare for its upcoming earnings. Now, I will do the same with United Airlines Holdings (I am a 25-year-old securities specialist working in private banking in Germany, with a longstanding interest in investing. My ability to analyze stocks has been honed through extensive research and the pursuit of several degrees, the titles of which do not translate well into English.My investment strategy primarily revolv ...