While almost all countries follow ICAO regulations, they are not legally bound to do so. ICAO sets global standards, and each country’s aviation authority is responsible for implementing these standards in their own way. However, most countries align their aviation laws and practices with ICAO’s guidelines to ensure safety and efficiency in international air travel. Some nations may have local variations or additional rules, but they still work within the framework established by ICAO for smooth and safe global aviation operations.