The Dow Jones Transportation Average rallied 0.6% toward a fifth-straight gain in morning trading Thursday, as another day of strength in its airline components helped the transports outperform the broader stock market, again. American Airlines Group Inc.'s stock jumped 5.3%, enough to pace the Dow transports' and the S&P 500's gainers. In other more-active airline stocks, shares of Delta Air Lines Inc. climbed 2.5%, JetBlue Airways Corp. hiked up 1.1%, Southwest Airlines Co. rose 3.0% and United Continental Holdings Inc. tacked on 3.4%. The NYSE Arca Airline Index jumped 2.4%, putting it on track for the highest close since Feb. 26. Meanwhile, the Dow Jones Industrial Average tacked on 30 points, or 0.1%, and the S&P 500 advanced 0.2%. On Wednesday, the Dow transports rose 0.5%, while both the Dow industrials and the S&P 500 fell 0.2%.