CHICAGO — A marriage between Chicago-based United Airlines and Houston-based Continental Airlines may have a limited impact on their key airport facilities, as they operate mostly complementary routes, but it could add to the negative pressures posed by industry consolidation, market participants said yesterday.

The boards of both airlines on Sunday approved the merger that involves a share swap valued at $3 billion. If it clears regulatory and union hurdles, the new company United Continental Holdings Inc. would unseat Delta Air Lines as the largest carrier and have $29 billion in revenues based on last year’s results.

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