Drones and planes in the sky

In Denmark, there is a special airport. People test drones and planes there. Today, drones and planes cannot fly together. It is dangerous . They may crash. But now, experts have a new system with fast sensors . These sensors can see every drone and every plane in the sky. They can fly safely together. Many small companies and university students work here. They build drones. Sometimes they crash them to learn how to make them better. Drones are very good for moving things from one place to another. They help people. There will be many more drones in our sky. People need technology to keep everyone safe.