What defines a simple terminal in an airport?

A simple terminal in an airport is characterized by having all processing functions centralized within a single building. This means that passengers can check-in, go through security, and access boarding gates all in one location. This design simplifies the travel experience, especially for smaller or less busy airports, as it minimizes the need for passengers to navigate between different structures or areas, making the entire process more efficient and user-friendly.

In contrast, a terminal that has multiple buildings for processing functions would be considered more complex and less straightforward for passenger navigation. Separate baggage claim and check-in facilities also imply a more complicated layout, which is not indicative of a simple terminal. Additionally, a terminal defined by a complex structure with high expansion capacity suggests a design intended for larger operations, with multiple services dispersed over a larger area, rather than the streamlined approach of a simple terminal.