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The Dow Jones Industrials (DJINDICES:^DJI) began the official second-quarter earnings season on a positive note, celebrating a solid performance from the industrial sector as a sign of strength in the overall economy. As of 11 a.m. EDT, the Dow was up 37 points, with investors likely holding off on major commitments until after the Federal Reserve releases its latest meeting minutes this afternoon. Yet Boeing (NYSE:BA) and United Technologies (NYSE:UTX) posted modest losses today, despite news that most would typically interpret as being positive for the aerospace giant and one of its key suppliers.

Ba
Source: Boeing.

What made Boeing's 0.4% drop so surprising is that it came in the aftermath of receiving a massive $56 billion order for 150 of its 777X airplanes from Emirates. In addition to the agreement, Emirates will obtain further rights to purchase an additional 50 planes at its discretion. Still, investors have known that the deal was in the works since last November, and it's unclear whether Boeing negotiated lower prices for Emirates than the $56 billion figure would indicate. Moreover, with production not even scheduled to start on the aircraft for three years, the contract represents just another piece of Boeing's massive backlog of orders on multiple popular aircraft models. There's no denying that Boeing has the opportunity of a generation to produce trillions of dollars in potential revenue in the years to come, but the Dow component needs to improve its execution in order to take full advantage of that opportunity.

Utx

Source: United Technologies.

Meanwhile, United Technologies fell about half a percent. Earlier this week, the company noted that it would showcase many of its most advanced systems for aircraft, both commercial and military, at a U.K. airs how starting next week. Yet there's some concern about whether the key F-35 fighter jet will appear at that event, as the Pentagon grounded the entire fleet of F-35s after a fire in an engine built by United Tech's Pratt & Whitney division. The F-35 program has already been a subject of debate given its high price tag, with an estimated cost of nearly $400 billion, and some shareholders worry about the impact of negative publicity on United Technologies' role in the program.

Even though Boeing and United Technologies are falling today, it's important not to give a single day's moves too much weight. With so much opportunity in aerospace and broader areas, the two Dow components should weather the storm and give investors long-term success.

Dan Caplinger has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.