A flight dispatcher (also known as an aircraft dispatcher, airline dispatcher, flight follower or flight operations officer) assists in planning flight paths, taking into account wind direction and speed, weather, storms, aircraft performance and loading, landing conditions at destination or alter airports, and other conditions. Dispatchers provide a flight following service and advise pilots if conditions or paths change. They usually work in the operations or control center of the airline. In the United States and Canada, the flight dispatcher shares legal responsibility with the commander of the aircraft (joint responsibility dispatch system).