The stock markets continued their slow slide into earnings season today, with the Dow Jones Industrial Average (DJINDICES:^DJI) losing 0.36% of its value and the S&P 500 (SNPINDEX:^GSPC) falling 0.3%. There wasn't a lot of economic news driving stocks, but investors were looking ahead at Alcoa's (NYSE:AA) earnings, which are due after the bell and are often seen as a barometer for earnings season overall. In the meantime, we have some big names leading the Dow lower, which this Fool thinks provides investors with some buying opportunities.

Boeing (NYSE:BA) has fallen 2.8% to lead the Dow's losers after its new 787 Dreamliner aircraft suffered the second technical problem in as many days. Yesterday, there was a fire on a Japan Air 787, and today a fuel leak was discovered on a different aircraft on the same airline. Small issues often arise in new planes, but the pace of incidents has investors worried right now. Until we hear what the final diagnosis is, I would stay cautious. But if the issues are small, this may be a great time to make a contrarian play and buy Boeing. The stock has a P/E of just 13 and a 2.5% dividend yield, and 787 deliveries are picking up pace, which should help future results.

The wireless space is being sold off today, and again, this may be a great long-term opportunity to get into some quality names. AT&T (NYSE:T) is down 1.6% today after it reported smartphone sales of 10 million in the fourth quarter, which beats last year's record of 9.4 million and should put it at 26.7 million smartphones for the year, beating its own expectation of 26 million. Yesterday, Verizon Wireless, which is a joint venture of Verizon (NYSE:VZ) and Vodafone (NASDAQ:VOD), said that it gained 2.1 million net subscribers and that smartphones made up 87% of device sales in the fourth quarter. In the short term, these numbers may put pressure on earnings because of phone subsidies, but this is great long-term news for both companies, so investors have a great buying opportunity before them.

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