Wall Street’s main indexes opened higher on Thursday as results from American Airlines and Travelers kept the positive momentum going for the fourth-quarter earnings season, a day after the tech-heavy Nasdaq index plunged into correction territory. The Dow Jones Industrial Average rose 74.01 points, or 0.21 percent, at the open to 35,102.66. The S&P 500 opened higher by 14.59 points, or 0.32 percent, at 4,547.35, while the Nasdaq Composite gained 122.60 points, or 0.85 percent, to 14,462.85 at the opening bell.