Antonio B. Won Pat International Airport

Military use

The airport was built by the Japanese Navy about 1943, calling the military airfield Guamu Dai Ni (Guam No. 2) as part of their defense of the Marianas. After the island was recaptured by American forces in 1944, it was renamed Agana Airfield, due to the proximity of the town. After being repaired in October 1944, the United States Army Air Forces Seventh Air Force used the airfield as a base for the 11th Bombardment Group, which flew B-24 Liberator bombers from the station until being moved to Okinawa in July 1945. With the reassignment of the heavy bombers, the 41st Photographic Reconnaissance Squadron flew long-range reconnaissance aircraft (F-4 P-38 Lightnings) from the field until January 1946.

After the war, the USAAF used the airfield for fighter defense of the Marianas (21st Fighter Group), (549th Night Fighter Squadron) until early 1947 and as a transport hub (9th Troop Carrier Squadron). In 1947, the USAAF turned over the airfield to the United States Navy, which consolidated its facilities with those at the closing Harmon Air Force Base in 1949, and operated Naval Air Station Agana until it was closed by the 1993 Base Realignment and Closure Commission.

Civilian use

Travel to Guam was restricted to military personnel with a security clearance until 1962. During these early years, a single Quonset hut served as Guam's air terminal. The lifting of this travel restriction spurred the development of the airport; its International Air Terminal opened in March 1967 and accommodated its first tour group from Japan two months later. Operations of the terminal were passed onto the Government of Guam's Department of Commerce in 1969. In 1975, the Guam International Airport Authority (GIAA) was created as a separate agency. After NAS Agana was closed in April 1995, GIAA took over the entire airport's operations.

A new passenger terminal building was opened in 1982, and the current, much larger terminal building was opened in phases between 1996 and 1998.

After a period of seasonal charters, the first regular flight to Mainland China from Guam was established in 2014. The United Airlines service to Shanghai Pudong Airport began on October 29, 2014.

Customs, immigration, and security inspections

Arrival passenger inspection is conducted by the U.S. Customs and Border Protection (CBP, immigration only) and Guam Customs & Quarantine Agency (GCQA). Departure security checks are conducted by the U.S. Transportation Security Administration (TSA).

Customs

Since Guam is outside the United States customs jurisdiction, passengers from all arrival flights go through GCQA inspection. Passengers bound for Honolulu (currently the only Stateside flight) go through a normal USCBP customs inspection upon arrival.

Immigration

The USCBP inspects all arriving passengers from foreign points. Passengers arriving from the U.S. Commonwealth of the Northern Mariana Islands (CNMI), a separate U.S. immigration jurisdiction with slightly different visa requirements, are pre-inspected there for admissibility to Guam. Nonstop passengers bound for Honolulu are pre-inspected at Guam's boarding gate for admissibility to the States because of the Guam & CNMI Visa Waiver Program, which gives tourists from certain Asian countries visa-free entry (to Guam/CNMI but not the States). For U.S. citizens, passports are not required to enter Guam from the CNMI (i.e., other forms of ID proving admissibility are accepted), but are required for those transiting a foreign country between the States and Guam.

Transit passengers (except from Honolulu and the CNMI) are also inspected by the USCBP before being allowed to proceed to their connecting gate. However, since all onward flights depart Guam's customs jurisdiction, no baggage claim is necessary.

Security

The TSA conducts security inspection for all departing passengers and all transit passengers not arriving from the States and the CNMI, which are already screened by TSA at their origins. However, Guam-Honolulu passengers who have onward connections must go through TSA inspection again in Honolulu because they will have come into contact with their checked baggage during U.S. customs inspection there.

Passenger terminal

The current passenger terminal's first phase was completed on September 10, 1996. The 550,000-square-foot (51,000 m²) terminal included a new customs and immigration hall and a 710 space parking lot. In August 1998 the second phase of the current passenger terminal opened. The expansion program that opened the current terminal had a cost of $741 million. The terminal has three levels. The basement level houses arrival facilities, including customs and baggage claim. The basement also houses the GIAA Airport Police and GIAA Arcade offices and the Hafa Adai Gardens. The apron level (the departure level) houses the ticketing counters. The third floor houses the departure gates, immigration facilities, and GIAA administrative offices.

Since all flights require customs or immigration inspection, the airport's post-security concourse and gate area was not designed to separate arriving and departing passengers. The only normal passenger entrance is through security and the only normal exit is through immigration. Except for the few gates designated for Honolulu arrivals, which route passengers directly to customs, all other gates do not have a separate arrival corridor. Arrival passengers walk directly into the gates waiting area, and in the past could actually purchase food or merchandise before entering the immigration hall.

The original design is said to be compliant with security standards at the time of opening. However, after the September 11, 2001 attacks, the U.S. government began to require separation of uninspected arrival passengers. The airport initially used a system of chairs, moving sidewalks, retractable belts and security/police staffing to usher arriving passengers from the gate to the immigration hall without coming into physical contact with departing passengers. In recent years, semi-permanent movable walls separate much of the length of the terminal building into two halves, decreasing the need for human staffing and those lighter objects previously in use.

Old terminal building

The old terminal served as the corporate headquarters of Continental Micronesia until late 2010. The 220,000-square-foot (20,000 m²), $43 million Commuter Terminal was dedicated on January 19, 1982. At the time of opening, the Guamanian people referred to the terminal as a "white elephant," believing that the terminal was so large that it would never be fully used. After the current terminal building opened, the old terminal building became the Commuter Terminal (serving Freedom Air and Pacific Island Aviation). By 2003 the Guam International Airport Authority moved commuter airlines out of the Commuter Terminal and leased the entire facility to Continental Micronesia.

Other facilities

Accidents and incidents

Several fatal accidents have occurred on and near Guam over the years. In total, 367 deaths occurred from 6 different aircraft accidents.