After years of planning, space tourism company Virgin Galactic (NYSE: SPCE) is gearing up to begin commercial space flights. The company recently completed its final test flight, a critical milestone that signals the beginning of a new age.

The start of commercial flights will bring in much-needed revenue. That's indeed a sign that brighter days are ahead for shareholders -- especially after sitting through the stock's 93% decline from its peak, right?

Well, not so fast. Investors should hold off on opening the champagne, because the stock could remain grounded for several reasons. Here are three of them.

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Source Fool.com