A 9-hour layover in 2026 is the "sweet spot" for exploring a new city. After factoring in 1 hour for deplaning/customs and 3 hours for returning/security, you have a solid 5-hour window for an excursion. In cities with world-class transit, like Singapore (Changi), you can take a free 2.5-hour city tour organized by the airport. In Amsterdam (Schiphol) or Zurich, the train takes you to the city center in under 20 minutes, allowing time for a boat cruise or a museum visit. If you prefer to stay at the airport, 2026 hubs like Doha (Hamad) or Seoul (Incheon) offer transit hotels where you can book a room for 6 hours to nap and shower. Many travelers in 2026 also use this time to visit an airport lounge via Priority Pass for free food and high-speed Wi-Fi. If your layover is in a city with "visa-on-arrival" or if you have the correct passport, 9 hours is the perfect amount of time to leave the airport, grab an authentic local meal, and be back at your gate with time to spare.