A Commercial Pilot License (CPL) allows a pilot to fly aircraft for hire or reward, such as charter flights, cargo, or co-pilot roles, after completing basic training and required flight hours (usually around 150–250 hours depending on the country). An Airline Transport Pilot License (ATPL) is the highest level of pilot certification and is required to become a captain of commercial airlines, typically requiring around 1,500 flight hours plus advanced exams. CPL is an entry-level professional license, while ATPL represents senior-level experience and full command authority. In aviation, pilots usually start with CPL and gradually progress to ATPL through accumulated experience.