Bets

Hawaiian Holdings Inc. HA 0.51% is investing in a company developing electric seagliders that the airline hopes to fly on short hops between islands.The battery-powered seagliders being developed by Regent, a Boston-based startup, are a hybrid of a boat and a plane. They would cruise five to 30 feet above the waves on average, flying on a cushion of air that keeps the plane aloft, known as the “ground effect.” Flying between the Hawaiian islands is a major source of…

The internal market commissioner at the European Union cautioned Mr. Musk a day after he struck a deal to buy Twitter that he would need to follow the bloc’s new rules on content moderation. EU regulators are but one of a number of forces—advertisers, users, law makers, activists—who can complicate Mr. Musk’s attempt to, in effect, return the platform to its early days, when its executives publicly described it as “the free speech wing of the free speech party." In the years since, Twitter…