B-17 Flying Fortress Timeline

(1935 - 1945)

The B-17 Flying Fortress was a four-engine heavy bomber developed by Boeing for the United States Army Air Corps. First flying in 1935, it became iconic for its daylight precision bombing campaigns over Europe during World War II. Known for its durability and defensive armament, the B-17 could sustain heavy damage and still return home, earning a legendary reputation among Allied aircrews. More Less

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Development and Design

Boeing begins design work on Model 299

Sep 16, 1934

After the US Army Air Corps issued a request for a multi-engine bomber, Boeing began designing its Model 299, which would evolve into the B-17 Flying Fortress. The company funded the project itself after losing earlier bomber contracts, betting on a four-engine design far larger than competitors' twin-engine proposals.

Image source: Boeing B-17 Flying Fortress

Model 299 prototype first flight

Jul 28, 1935

The Boeing Model 299 prototype, later designated XB-17, made its maiden flight from Boeing Field in Seattle. A newspaper reporter coined the term 'Flying Fortress' upon seeing its array of machine guns, a nickname Boeing quickly trademarked.

Model 299 crash at Wright Field ends evaluation

Oct 30, 1935

The Model 299 crashed on takeoff at Wright Field, Ohio, when the pilots forgot to release the flight control gust locks. The accident killed test pilot Leslie Tower and Army Lt. Donald Putt's crew member, and led the Army to select the smaller Douglas B-18 Bolo instead, though Boeing was allowed limited further development.

US Army orders 13 YB-17 service test aircraft

Jan 17, 1936

Despite the prototype crash, impressed by its performance, the Army Air Corps ordered 13 YB-17 aircraft for service testing. These aircraft allowed crews to develop long-range flying techniques and helped prove the concept of strategic bombardment.

Image source: Boeing B-17 Flying Fortress

YB-17 enters service with 2nd Bombardment Group

Mar 1, 1937

The first operational B-17s were delivered to the 2nd Bombardment Group at Langley Field, Virginia, making it the first US Army Air Corps unit equipped with four-engine bombers. Crews used them to refine navigation and high-altitude bombing procedures.

B-17C and B-17D variants improve defenses

Jul 1, 1940

The B-17C and B-17D introduced self-sealing fuel tanks, additional machine guns, and armor protection for crew. Some early models were sent to Britain as the Fortress I, where combat experience revealed inadequate defensive armament.

Image source: List of Boeing B-17 Flying Fortress variants

B-17E introduces powered tail turret and new tail

Sep 5, 1941

The B-17E featured a redesigned larger tail fin for improved stability, a remote-controlled belly turret, and a manned tail gun position, dramatically improving defensive coverage against fighter attack from the rear.

B-17F variant enters production

May 30, 1942

The B-17F, the first major production version built by Boeing, Douglas, and Lockheed Vega, added frameless plexiglass nose glazing, more powerful engines, and increased bomb capacity. Over 3,400 were built.

B-17G enters service with chin turret

Oct 1943

The final major variant, the B-17G, added a Bendix remotely operated chin turret under the nose to counter head-on fighter attacks, along with staggered waist guns. Nearly 8,700 B-17Gs were produced, making it the most numerous version.

World War II Combat

RAF Bomber Command begins daylight raids with Fortress I

Jul 8, 1941 - Sep 1941

Britain's No. 90 Squadron RAF began daylight operations over occupied Europe and Norway using B-17Cs designated Fortress Is. High losses and poor bombing accuracy led the RAF to abandon daylight use by September 1941, but lessons informed future tactics.

Image source: No. 90 Squadron RAF

B-17s of 19th Bomb Group arrive in the Philippines

Sep 12, 1941

The 19th Bombardment Group flew B-17Ds across the Pacific to Clark Field in the Philippines as part of efforts to reinforce American Far East Air Force ahead of anticipated war with Japan.

Image source: 19th Operations Group

Japanese attack destroys B-17s at Clark Field

Dec 8, 1941

Hours after the Pearl Harbor attack, Japanese aircraft struck Clark Field in the Philippines, destroying or damaging most of the B-17s on the ground there, crippling America's heavy bomber strength in the western Pacific.

Eighth Air Force established for Europe operations

Jan 28, 1942

The US Army Air Forces activated Eighth Air Force, which would grow into the primary operator of B-17s in Europe, eventually conducting massive daylight precision bombing campaigns against German industry.

Image source: Eighth Air Force

B-17s sink Japanese destroyer in Java Sea action

Feb 1942

During the defense of the Dutch East Indies, B-17s operating from Java attacked Japanese invasion convoys; a B-17 skip-bombing run sank destroyer Minegumo-class vessel Natsushio, one of the few confirmed B-17 sinkings of a warship underway.

First Eighth Air Force B-17 raid on Rouen

Aug 17, 1942

Twelve B-17Es of the 97th Bomb Group, escorted by RAF Spitfires, attacked the Sotteville-lès-Rouen rail yards in France in the first Eighth Air Force mission flown from England, marking the start of the US daylight strategic bombing offensive.

Image source: Rouen Cathedral

Pacific B-17 campaign winds down as B-29 arrives

1943 - Jul 1944

In the Pacific, B-17s had conducted early anti-shipping strikes and raids from Australia and New Guinea, but the longer-ranged B-29 Superfortress gradually replaced them in theater, with the last combat B-17 missions flown in mid-1944.

Image source: Boeing B-29 Superfortress

Memphis Belle completes 25-mission tour

May 17, 1943

The Memphis Belle, a B-17F of the 91st Bomb Group piloted by Robert Morgan, became one of the first B-17s to complete 25 combat missions over Europe. The achievement and its crew's subsequent war bond tour made the aircraft an enduring symbol of the air war.

Image source: Memphis Belle (aircraft)

First Schweinfurt raid suffers heavy losses

Aug 17, 1943

In a double strike on Regensburg and ball bearing plants at Schweinfurt, Eighth Air Force lost 60 of 376 B-17s, demonstrating the vulnerability of unescorted deep-penetration daylight raids and forcing a pause in such missions.

Image source: Schweinfurt–Regensburg mission

Second Schweinfurt raid known as Black Thursday

Oct 14, 1943

Of 291 B-17s sent against Schweinfurt's ball bearing factories, 77 were destroyed and many others damaged beyond repair. The catastrophic losses proved unescorted bombers could not survive deep into Germany and accelerated the push for long-range escort fighters.

Image source: Second Schweinfurt raid

P-51 Mustang escorts enable deep-penetration raids

Dec 1943

Long-range P-51 Mustang fighters equipped with drop tanks began escorting B-17 formations all the way to Berlin, slashing bomber losses and restoring confidence in the daylight precision bombing campaign.

Image source: North American P-51 Mustang

'Big Week' offensive targets German aviation industry

Feb 20, 1944 - Feb 25, 1944

During Operation Argument, known as Big Week, Eighth Air Force B-17s and B-24s launched six days of concentrated raids on German aircraft factories, inflicting critical damage on Luftwaffe production and fighter force readiness.

B-17 raids support D-Day invasion preparations

May 1944 - Jun 6, 1944

In the months leading up to and including D-Day, thousands of B-17 sorties pounded French railway networks, bridges, coastal defenses, and V-weapon sites, isolating Normandy and softening German defenses for the Allied landings.

Image source: Operation Overlord

First shuttle raid lands B-17s in Soviet Union

Jun 2, 1944 - Jun 11, 1944

Under Operation Frantic, B-17s bombed targets in Germany and eastern Europe then continued on to land at Poltava and other bases in the USSR rather than returning to England, extending the reach of the strategic bombing campaign.

Image source: Operation Frantic

B-17s conduct final European combat missions

Apr 25, 1945

Eighth Air Force B-17s flew their last strategic bombing missions of the war against targets such as armament works near Prague and Skoda facilities days before Germany surrendered, ending the type's principal combat role in Europe.

Postwar Service

Air Sea Rescue B-17s patrol Atlantic and Pacific

Feb 1945 - 1950

Modified B-17H aircraft carrying airborne lifeboats served as search-and-rescue platforms, locating downed aircrew and survivors at sea. They remained in this role with the US Air Force until about 1950.

B-17 drones used in Operation Crossroads tests

Jul 1946

Radio-controlled B-17 drones flew through atomic cloud columns during the Bikini Atoll nuclear tests to collect radioactive samples, pioneering postwar drone technology and atmospheric sampling missions.

Image source: Operation Crossroads

Israel acquires surplus B-17s for independence war

May 15, 1948

Three B-17Gs smuggled out of the United States reached Israel during the 1948 Arab-Israeli War and were immediately thrown into action, bombing Cairo and other Arab targets despite arriving without gunsights or trained crews.

Image source: 69 Squadron (Israel)

Coast Guard retires last PB-1G rescue Fortresses

Oct 14, 1956

The US Coast Guard, which had used B-17 derivatives designated PB-1G for air-sea rescue and patrol since 1945, retired its last examples, ending the type's maritime service career.

Image source: United States Coast Guard Cutter

Last B-17 retired from US military service

Aug 6, 1957

The final active-duty B-17, a VB-17G assigned to the Air Research and Development Center at Holloman Air Force Base, was retired, closing out two decades of US military service that included over 290,000 wartime sorties.

Legacy and Preservation

Surviving B-17s restored as flying warbirds

1970

Museums and volunteer groups progressively returned a small number of surviving B-17s to airworthy condition. Aircraft such as Yankee Lady and Sentimental Journey now appear at airshows, keeping the Flying Fortress legacy alive for new generations.

Image source: List of surviving Boeing B-17 Flying Fortresses

Key Facts

The B-17 Flying Fortress first flew on July 28, 1935, as Boeing's Model 299 prototype.
It served as the primary U.S. strategic bomber in the European Theater, conducting daytime precision raids against German industry.
Over 12,700 B-17s were produced between 1936 and 1945, with the most numerous variant being the B-17G.
The aircraft was heavily armed, typically carrying around 13 machine guns across multiple turrets and positions.
B-17s were renowned for their ability to absorb severe battle damage and still return their crews safely to base.

Source

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