Wall Street pointed modestly higher early Tuesday as markets prepare to digest another heavy slate of corporate earnings. Futures for the Dow were 0.1% higher before the opening bell, while S&P 500 futures rose 0.2%. General Motors rose 4.2% after the automaker reported that its first-quarter net income rose more than 25% on strong deliveries of pickup trucks and other higher-profit vehicles. JetBlue shares tumbled more than 10% after the airline posted another decline in sales and lowered its revenue outlook for the year. About a third of the companies in the S&P 500 are scheduled to report earnings this week.
