An airline-terminal serves as the central hub for passenger processing and aircraft boarding. These structures vary in size, design, and amenities, depending on the airport and its location. Some airports, such as Singapore Changi Airport or Hamad International Airport in Doha, boast luxurious terminals with high-end shopping, entertainment, and relaxation areas, while others focus on efficiency and functionality. Regardless of the terminal's design, all terminals follow a similar structure to facilitate smooth passenger movement.