Shares of Delta Air Lines (DAL) have gained 3.6% over the past four weeks to close the last trading session at $58.77, but there could still be a solid upside left in the stock if short-term price targets of Wall Street analysts are any indication. Going by the price targets, the mean estimate of$73.59 indicates a potential upside of 25.2%.The mean estimate comprises 20 short-term price targets with a standard deviation of $5.73. While the lowest estimate of$65.00 indicates a 10.6% increase from the curre ...