Most airlines do not accept foreign pilot licenses directly for commercial flying jobs, and pilots usually need to complete a license conversion process before working in another country. Conversion requirements vary by aviation authority and may include written exams, medical checks, flight tests, language proficiency, and additional flight hours. Authorities such as the Federal Aviation Administration, European Union Aviation Safety Agency, and Directorate General of Civil Aviation each have their own conversion rules. The process ensures pilots meet local aviation safety and operational standards before being hired.