The PBY Catalina — the flying boat San Diego built by the thousands.

On a bright California morning in 1936, a twin-engine flying boat rolled down a ramp on Pacific Highway, slid onto the surface of San Diego Bay, and lifted into air that smelled of salt and engine exhaust. The aircraft was a production PBY-1, built by Consolidated Aircraft Corporation, which had relocated its entire operation from Buffalo, New York to San Diego the previous year — drawn by the flat water of the harbor, the year-round flying weather, and a Navy that needed patrol range more than it needed speed. From that first delivery, Consolidated would go on to manufacture more than 3,300 of these aircraft in San Diego alone, and the machine the British named the PBY Catalina — after the island visible on clear days off the California coast — would become the most consequential patrol aircraft of the Second World War.

What Reuben Fleet's engineers had produced was a paradox of ungainliness and endurance. The Catalina wore its parasol wing high above a deep-bellied hull that served equally as fuselage and boat, with a Pratt & Whitney R-1830 Twin Wasp turning a propeller under each wingtip. It cruised at a leisurely 125 miles per hour but carried that pace across ranges exceeding 2,500 miles — an endurance that made the faster, sleeker aircraft of the era look provincial by comparison. A crew of seven to nine lived inside that hull for missions stretching sixteen, eighteen, sometimes twenty-four hours, scanning grey ocean through blisters of plexiglass while the pilots above them flew by feel and dead reckoning. The Catalina was not a beautiful machine. It was a deeply useful one, and in 1939, when the United States Navy looked across the Pacific with growing unease, "useful" was exactly what the next war was going to require.

The Catalina's most celebrated single act came not in the Pacific but in the cold grey chop of the North Atlantic, on the morning of May 26, 1941. The German battleship Bismarck had vanished into overcast after sinking HMS Hood and damaging HMS Prince of Wales three days earlier, and the Royal Navy was losing her. A PBY Catalina from No. 209 Squadron RAF, piloted by Flying Officer Dennis Briggs and carrying American co-pilot Ensign Leonard "Tuck" Smith — a US Navy officer attached under a secret arrangement that predated Pearl Harbor — broke through cloud at 10:30 in the morning to find the Bismarck steaming for the French coast, six hundred miles from safety. Smith held the Catalina low as enemy gunfire punched holes in the hull and radioed the contact report that the Royal Navy followed to intercept. The most powerful battleship afloat was run to ground and sunk two days later. A flying boat from San Diego found her.

Six months later, the same type of aircraft were deciding the war in the Pacific. At 9:25 on the morning of June 3, 1942, Ensign Jack Reid, flying a PBY from Patrol Squadron VP-44 out of Midway, spotted a formation of Japanese ships 700 miles to the southwest and transmitted the contact that put the American fleet on battle footing. That night, four more Catalinas from VP-44 made history again, delivering the first American torpedo attack of the engagement in total darkness against the Japanese occupation force — a night run so improbable the enemy initially reported the attackers as submarines. One torpedo struck the oiler Akebono Maru, drawing blood hours before the dive-bombers arrived. At dawn on June 4th, Lieutenant Howard Ady in a PBY from VP-22 raised the four Japanese carriers northeast of Midway and sent the sighting report that sent the Dauntless squadrons to their decisive runs. The Battle of Midway turned on intelligence and timing; the Catalina provided both.

The mission that gave the PBY its most enduring legend was the one that involved no weapons at all. Beginning in 1943, dedicated rescue Catalinas — nicknamed "Dumbos" after the Disney flying elephant — began landing in open ocean under enemy fire to pull downed airmen from the sea. On February 15, 1944, Lieutenant Nathan Gordon set his Catalina down off Kavieng three separate times through Japanese strafing attacks, hauling survivors out of shark-infested water until his hull held fifteen men who would otherwise have drowned. Gordon received the Medal of Honor. Meanwhile, the "Black Cat" squadrons — PBYs painted matte black and stripped of every non-essential pound — flew night harassment missions against Japanese shipping from the Solomons to the Philippines, attacking harbors, sinking freighters, and radioing fleet movements in the darkness. By the war's end, Catalinas had rescued an estimated 4,000 downed airmen in the Pacific theater alone. The aircraft was many things: it was a bomber, a patrol plane, a torpedo carrier. But the men who owed it their lives remembered it only as the thing that came when no one else could.

Behind every one of those missions was San Diego. The Consolidated factory on Pacific Highway grew to employ nearly 45,000 workers at its wartime peak, running three shifts, its assembly lines stretching the length of city blocks. Completed PBYs were rolled to the water's edge and launched from ramps directly into the harbor, then test-flown over the same bay where the Navy had trained carrier aviators since 1917. Women who had never handled a rivet gun before Pearl Harbor became precision riveters; machinists who had repaired fishing boats learned to safety-wire aircraft engines. Across the water at Naval Air Station North Island on Coronado, the patrol crews who would fly those aircraft across the Pacific received their orders. The city did not merely support the war effort. It manufactured it, one flying boat at a time, and sent each one west over the same horizon it still faces today.

The Catalina outlasted the conflict it helped win. Allied nations flew PBYs into the 1960s; civilian operators pressed them into service as water bombers and survey aircraft well into the 1980s. The last operational military Catalina retired from the Brazilian Air Force in 1983, forty-seven years after the first production model lifted from this harbor. A handful of airworthy examples still exist, and on certain clear mornings their owners taxi them onto open water, let the hull climb free of the surface, and feel the parasol wing catch the same Pacific light the Consolidated test pilots chased over this bay in the 1930s. They called it ugly. They called it slow. They called it, when the war was worst and the water was very far from anywhere, the most beautiful thing they had ever seen.

The same bay that launched those flying boats — flat in the early morning, wide and brackish and lit gold before the city wakes — runs past the same shoreline where the rivets were driven and the engines were run up and the crews were briefed and sent west into the Pacific. The water doesn't know the difference between then and now. You could sail it tonight.