Ninoy Aquino International Airport (NAIA), also known as Manila International Airport, serves Manila and the surrounding metropolitan area. Located about seven kilometers south of Manila proper, NAIA is the main international gateway for travelers to the Philippines and is the hub for all Philippine airlines.

The airport has three terminals and is managed by the Manila International Airport Authority (MIAA), a branch of the Department of Transportation and Communications (DOTC). The airport’s Terminal 1 building was constructed in 1981 and has a total area of 67,000 sqm with a capacity of 4.5 million passengers per year. The building consists of three structurally separated parts: a main building and two wings.

Previously, NAIA Terminal 1, compared to international terminals in other Asian countries was consistently ranked at the bottom, due to limited and outdated facilities, poor passenger comfort, and the facility long ago exceeding its design capacity.

In regards to this, in November 2011, several transport authorities have started to makeover and upgrade the NAIA Terminal 1 into an “Airport City”, which includes the expansion of the arrival area, additional parking lots, and improvement of facilities in the terminal. Transport authorities also realized the need for seismic evaluation of the NAIA terminal 1 building to ensure the public safety. In this regard, AIT Consulting and Sy^2 + Associates, Inc.,

Philippines were invited to carry out the Seismic Performance Evaluation of NAIA Terminal 1 and have already performed a preliminary evaluation of the terminal, where the overall response and behavior of the structural systems were checked. The next stage of the project includes a detailed evaluation, which will be achieved by a nonlinear seismic analysis. Design for structural enhancement will also be carried out if needed.