Air traffic controllers coordinate the movement of aircraft to maintain safe distances between them. Air traffic controllers work in control towers, approach control facilities, or en route centers. Their work can be stressful because maximum concentration is required at all times. Night, weekend, and rotating shifts are common. There are several paths to becoming an air traffic controller. Candidates typically need an associate’s or a bachelor’s degree from the Air Traffic Collegiate Training Initiative program, several years of progressively responsible work experience, or a combination of education and experience. They also must be a U.S. citizen, submit to medical and background checks, and complete training at Federal Aviation Administration (FAA) academy.