The primary difference between an FAA (Federal Aviation Administration, USA) and EASA (European Union Aviation Safety Agency) pilot license lies in the regulatory philosophy and theory requirements. EASA licenses are generally considered more academically rigorous, requiring students to pass 14 extensive theoretical exams covering topics like meteorology and flight planning in great detail. The FAA path tends to be more practical and cost-effective, with fewer written exams and a focus on flight hours and hands-on skill. Additionally, the licenses are not directly interchangeable; a pilot with an FAA license must undergo specific "conversion" training and testing to fly European-registered aircraft commercially, and vice versa, though the two authorities have made strides in mutual recognition for private pilots.