There is one terminal building at Portland International Airport, which is split into two sections. These are named the South Terminal and the North Terminal. There are five concourses spread across the terminal building, each named A–E. However, Concourse A is expected to be demolished in the near future, with plans to expand and renovate both Concourse B and E.
The South Terminal is where Concourse A–C is situated, which is mainly used by airlines such as Alaska Airlines, American Airlines and JetBlue Airways.
The North Terminal is used by a mix of the other airlines that fly to/from the airport. The majority of international flights fly out of the North Terminal, with a dedicated international section at Concourse D. The North Terminal is also where the majority of the airport lounges are located.