Airline captains are responsible for safely flying the aircraft to its destination. In a commercial airliner, captains fly with a co-pilot who can fly the plane should something happen to the captain. The initial tasks performed by the captain before taking off include receiving weather information, conducting preflight checks on the navigation systems, and communicating with tower controllers to ensure no collisions occur. Once in the air, the captain and co-pilot rotate flying responsibilities to avoid either becoming too tired; additionally, modern aircraft include a cruise control or auto-pilot that helps keep the plane on course automatically. During flight, the captain also communicates the status of the flight to passengers, as well as checks location, flight path, and weather patterns periodically to confirm accuracy of the computer's flight plan.