Delta Air Lines (DAL) stock is gearing up for its fiscal third-quarter earnings report, which is due out before the open on Thursday, Oct. 9. The shares still sport a 47.2% six-month lead despite a recent pullback from their early September peak, while support at the $56 level is emerging as a floor. What’s more, a long-term historically bullish trendline could help DAL bounce back, should quarterly results impress.According to Schaeffer’s Senior Quantitative Analyst Rocky White, Delta Air Lines stock is wi ...