Yes, you can apply for an ATPL if you have a different pilot license, such as a CPL (Commercial Pilot License). However, you will need to meet specific requirements, including completing 1,500 flight hours and passing written exams. If you already hold a CPL, you can upgrade it to an ATPL by gaining more flight experience, completing additional training, and passing the necessary exams. It’s a process that builds on the foundation of your existing pilot training.