Gates may include a waiting area for passengers before boarding their flight. While the exact specifications vary from airport to airport and country to country, most gates consist of seating, a counter, and an entry or exit doorway leading to the aircraft. Gates adjacent to a passenger concourse may be connected by way of a jet bridge or they may require that passengers board from the apron directly using mobile stairs or airstairs built into the aircraft itself. Remote gates also use stairs for boarding but require ground transportation to move passengers between the terminal and the aircraft parking location.