The four basic forms of terminal geometries in airport architecture are satellite (circular, rectangular, or star-shaped), linear, pier, and open apron with transporter. 13 —De Neufville: centralized or satellite finger, linear or gate arrival, and open apron/transporter. 14 —Gates, parking, and access roads are located near the terminals' central areas. There are two main types of satellite terminals: those with one central building called the "hub" and those without a hub. In both cases, the term "satellite" refers to the fact that each aircraft landing at a large airport like Dallas/Fort Worth serves as the center for a small circle or "cell" of activity including baggage claim, security screening, food service, retail shops, etc. The cell centers around the aircraft with no specific fixed location for any particular customer, company, or brand. Each cell contains facilities necessary to complete these tasks or services. In most cases, satellite airports are fairly new developments intended to alleviate congestion at larger airports. They usually include a single central building with administrative offices, rental cars, stores, restaurants, bars, lounges, banks, gift shops, technology labs for portable electronic devices, waiting rooms, medical clinics, childcare facilities, sports complexes for check-in golf carts, training programs for jobs at the airport, conference rooms, and public transportation to nearby cities.