SpaceX charges less than United Launch Alliance for rocket launches -- but United Launch Alliance launches have been more reliable.

For the longest time -- at least as time is measured among newfangled space stocks -- this has been a truism in the space industry. It's the reason SpaceX is believed to be, at best, inconsistently profitable, whereas Boeing (NYSE: BA) and Lockheed Martin (NYSE: LMT), the two companies that form the United Launch Alliance (ULA) joint venture, pull down profit margins of anywhere from 6% to 9% in their space divisions, according to data from S&P Global Market Intelligence.

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Source Fool.com