Delta Air Lines (DAL) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this airline have returned -1.5%, compared to the Zacks S&P 500 composite's +2.5% change. During this period, the Zacks Transportation - Airline industry, which Delta falls in, has lost 3.5%. The key question now is: What could be the stock's future direction?Although media repor ...