Antitrust battle over iPhone app store goes to appeals court

Apple is heading into a courtroom faceoff against the company behind the popular Fortnite video game, reviving a high-stakes antitrust battle over whether the digital fortress shielding the iPhone’s app store illegally enriches the world’s most valuable company while stifling competition.

Oral arguments Monday before three judges on the Ninth Circuit Court of Appeals are the latest volley in legal battle revolving around an app store that provides a wide range of products to more than 1 billion iPhones and serves as a pillar in Apple’s $2.4 trillion empire.