In 2026, Paris Charles de Gaulle (CDG) is the busiest airport within the European Union, but it is generally the third busiest in all of Europe by passenger volume, trailing behind London Heathrow (LHR) and Istanbul Airport (IST). While Heathrow remains the leader with over 83 million annual passengers, CDG handles approximately 70 million, making it a massive global hub. In terms of physical land area, CDG is indeed one of the largest, covering over 32 square kilometers, which is roughly one-third the size of the city of Paris itself. It also ranks second in Europe for cargo traffic, only behind Frankfurt. While "biggest" can be subjective—referring to passengers, land size, or number of runways—CDG consistently dominates the EU market and serves as the primary base for Air France and a major node for the SkyTeam alliance. Its complex layout of three main terminals and numerous satellites makes it one of the most operationally vast aviation facilities on the continent.