A Code F aircraft is a classification used by the International Civil Aviation Organization (ICAO) to categorize the world's largest airplanes based on their physical dimensions, specifically their wingspan and outer main gear wheel span. For an aircraft to be designated as Code F, it must have a wingspan of at least 65 meters (213 feet) but less than 80 meters (262 feet). The most famous examples of Code F aircraft are the Boeing 747-8 and the Airbus A380-800. Because these planes are so massive, many airports are not equipped to handle them; they require wider runways (typically 60 meters), larger taxiway clearances, and specialized "double-decker" boarding bridges. The "F" code is the highest in the ICAO reference system (running from A to F). In the United States, the FAA uses a similar but slightly different system called Airplane Design Groups (ADG), where Code F planes typically fall into Group VI. Knowing a plane's code is essential for airport planners to ensure that the pavement can support the weight and that the wingtips won't hit light poles or other aircraft while taxiing.