In order to become an aeronautical engineer, prospective candidates must complete a bachelor's degree program, usually in aerospace or aeronautical engineering. Once students have completed their core requirements, they may take more challenging classes that cover topics ranging from the aerodynamics of airplane bodies to electrical systems in cockpits. After covering the fundamentals of flight and stability control, students may delve into aircraft sensors and electrical components, as well as wing structure and flaps. Programs may also provide training in power generation for aircraft, including combustion engine design. Graduates must take two examinations and accrue four years of work experience in order to become licensed professional engineers (PEs) in their state. They can use the title of EIT, or engineer in training, after passing the first Fundamentals of Engineering (FE) exam, which can be taken any time after graduation. EITs must also complete a minimum of four years' on-the-job training, after which they take the PE exam to become professional aeronautical engineers.