The Federal Office of Civil Aviation (FOCA), also known as BAZL, OFAC and UFAC, is Switzerland’s civil aviation supervisory authority. It oversees aviation infrastructure, aircraft, personnel and aviation companies, and helps formulate and implement national aviation policy. Its work connects safety oversight with sustainable aviation development and internationally agreed standards. Official resources cover aircraft registration, airworthiness and type certification, operational approvals, drone requirements, occurrence reporting, aerodromes and passenger rights. The office provides subject-specific contacts for technical and administrative enquiries. Its physical Ittigen office is at Papiermühlestrasse 172; postal correspondence uses the separate 3003 Bern address.