US Airways and American Airlines moved closer to creating the world’s biggest airline Friday, as US Airways shareholders overwhelmingly approved their proposed merger.

Shareholders of US Airways Group Inc. would get 28 percent of the shares in the combined company, with the rest going to creditors, employees and shareholders of American Airlines parent AMR Corp.

US Airways said that 132,273,780 shares were voted in favor of the merger while 257,757 shares were voted against it. Another 256,523 abstained.

The merger is still being reviewed by antitrust regulators at the U.S. Department of Justice. It also needs the approval of American’s creditors the judge overseeing the airline’s bankruptcy proceedings.

Critics of the merger worry that it will reduce competition and drive up prices. Similar complaints arose around the mergers of Delta and Northwest in 2008, United and Continental in 2010, and Southwest and AirTran in 2011. Antitrust regulators allowed all those deals to go through.

Those other mergers changed the industry landscape, creating giants that made it harder for US Airways and American to compete, said Doug Parker, CEO of Tempe-based US Airways.

The merger “creates a fourth strong competitor to United, Delta and Southwest,” said Parker, who will become CEO of the combined carrier, which will keep the American Airlines name and be based in Texas.

If the American-US Airways deal goes through, those four airlines will control more than 80 percent of the domestic air-travel market.