The number one ranked airport in the world is Singapore's Changi International Airport. It contains a free movie theater, a butterfly garden, a rooftop swimming pool, and 24-hour spas. It's clean. It's efficient, and this really gives travelers a great experience. This is great feedback, because on average the airport serves 62.2 million passengers a year. They've also made the check-in process easier for passengers by have several kiosk.