Pier finger concept emerged when gate concourses were added to simple-unit terminal. The extension concourses known as pier or finger. This concept provides opportunity to maximize the number of aircraft parking spaces with less infrastructure. The aircraft can be park both side of pier. It has more hold rooms at gates, loading bridges, and vertical separation or departing and arriving passengers. Since the additional piers are added, resulting to longer distances between gates, and other facilities. It might cause passengers' confusion in the directions. Moreover, this concept expanded only the piers but not the main corridors connecting the concourses. This would lead to passengers crowding in the main areas. Another con of this concept are the extended concourses might reduce the apron space for aircraft parking, and the constraint on aircraft movement especially when the aircraft park closer to terminal.