The first air fields were more concerned with utility than comfort. In the early years, tents were the only amenities set up for enthusiastic crows who flocked to watch aviators' exploits. During the war, open fields provided a runaway, and hangars stored maintenance gear and airplanes. The first passengers became used to enduring the elements as they walk out to their flight. As the popularity of air transport increased, cities recognized the need to provide better service to passengers, and airports grew in design, to become the hub of activity and convenience they are today. Some include post offices, as well as restaurant, and even hotel on site.