American Airlines emerges from bankruptcy protection and US Airways culminates its long pursuit of a merger partner when the two complete their deal Monday and create the world's biggest airline.

The merger survived a challenge from the government and criticism from consumer groups, who fear it will lead to higher prices. It's the latest in a series of mergers that will leave four airlines controlling more than 80 percent of the U.S. air-travel market and with more power than ever to limit seats and boost profits.

When American emerges from bankruptcy as American Airlines Group Inc., it will mark a monumental victory for CEO Doug Parker and his executive team at smaller US Airways, who convinced American's creditors that a merger made more sense than letting American fly solo.

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