Stocks open with strong gains after Tesla earnings, airline results

Stock indexes were posting strong gains after the opening bell Thursday as investors cheered earnings from electric-vehicle maker Tesla Inc. and upbeat updates from airlines and other corporate results. The Dow Jones Industrial Average advanced 230 points, or 1.7%, while the S&P 500 rose 1.1% and the Nasdaq Composite surged 1.7%. Tesla shares were up more than 9%, while United Airlines jumped more than 10% and American Airlines rose more than 8%.

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