Drone powerhouse Israel is translating the know-how of air force veterans to the delivery of sushi and ice cream, as companies tap their expertise to avoid collisions in increasingly crowded skies. On a grassy stretch of a Tel Aviv beachfront, three drones flew above shiny high-rises this week, propellers buzzing as they lowered down onto landing pads. Two carried sushi and a third hauled cans of beer. Their flight was made possible by High Lander, an Israeli company that specializes in traffic control for autonomous drones, and Cando, which helps craft drone strategies for clients. “To fly one drone is not an issue,” High