American Airlines emerges from bankruptcy protection and US Airways culminates its long pursuit of a merger partner when the two complete their deal today 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.

The American Airlines name will live on, while US Airways will join Continental and other airlines that now exist only in the memories of longtime travelers.