The U.S. recently approved the merger between Delta Air Lines and Northwest Airlines, allowing the companies to operate as a single carrier. The merger, which creates the largest airline in the world, will have several long-term effects for passengers. For example, higher airfares are expected. "Whenever you reduce the number of competitors in the marketplace, the upward pressure on fares is inevitable," said Tim Winship, publisher of FrequentFliers.com.
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