Hawaii Clipper was one of three Pan American Airways

Pan American World Airways

Pan American World Airways, commonly known as Pan Am, was the principal and largest international air carrier in the United States from 1927 until its collapse on December 4, 1991...

 Martin M-130

Martin M-130

|-See also:-External links:* at the University of Miami Library*...

 flying boat

Flying boat

A flying boat is a fixed-winged seaplane with a hull, allowing it to land on water. It differs from a float plane as it uses a purpose-designed fuselage which can float, granting the aircraft buoyancy. Flying boats may be stabilized by under-wing floats or by wing-like projections from the fuselage...

s. It disappeared with 6 passengers and 9 crew en route from Guam

Guam

Guam is an organized, unincorporated territory of the United States located in the western Pacific Ocean. It is one of five U.S. territories with an established civilian government. Guam is listed as one of 16 Non-Self-Governing Territories by the Special Committee on Decolonization of the United...

 to Manila

Manila

Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

, on July 28, 1938.

Pan American initiated trans-Pacific airmail service on 22 November 1935; and began carrying passengers in October 1936. The flying boat service between San Francisco Bay

San Francisco Bay

San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...

 and Manila Bay

Manila Bay

Manila Bay is a natural harbor which serves the Port of Manila , in the Philippines.The bay is considered to be one of the best natural harbors in Southeast Asia and one of the finest in the world...

 required approximately sixty hours of flying time over six days with intermediate stops at Pearl Harbor

Pearl Harbor

Pearl Harbor, known to Hawaiians as Puuloa, is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the U.S. Pacific Fleet...

, Midway Atoll

Midway Atoll

Midway Atoll is a atoll in the North Pacific Ocean, near the northwestern end of the Hawaiian archipelago, about one-third of the way between Honolulu, Hawaii, and Tokyo, Japan. Unique among the Hawaiian islands, Midway observes UTC-11 , eleven hours behind Coordinated Universal Time and one hour...

, Wake Island

Wake Island

Wake Island is a coral atoll having a coastline of in the North Pacific Ocean, located about two-thirds of the way from Honolulu west to Guam east. It is an unorganized, unincorporated territory of the United States, administered by the Office of Insular Affairs, U.S. Department of the Interior...

 and Guam. Hawaii Clipper departed Guam on the last leg of the westbound journey at 11:39 local time. The last radio contact was 3 hours 27 minutes later, when the aircraft reported flying through layers of clouds and moderately rough air 565 miles from the Philippine coast. Search for the plane was called off on August 5, 1938.

Hawaii Clipper was the first of the initial three long-range flying boats to be lost. It was the worst Pacific airline accident at the time; although fatalities were higher when the other two Martin M-130 flying boats crashed later. The Philippine Clipper crash of 1943 killed 19, and 25 died when China Clipper

China Clipper

The China Clipper was the first of three Martin M-130 four-engine flying boats built for Pan American Airways and was used to inaugurate the first commercial transpacific air service from San Francisco to Manila in November, 1935. Built at a cost of $417,000 by the Glenn L...

crashed in 1945.