The first air fields were more concerned with utility than comfort. In the early years, tents were the only amenities offered to enthusiasts. During the war, fields became runways, and hangars stored maintenance gear and airplanes. As the popularity of air transport increased, cities recognised the need to provide better service to passengers, and airports grew in design and sophistication becoming the hub of activity and convenience they are today with post offices, restaurants, shopping centers and hotels on site.