The Keystone XOK was an American biplane observation floatplane developed for the United States Navy during the early 1930s. In 1929, the Navy issued requirements...

Keystone B-5 is a light bomber made by the Keystone Aircraft company for the United States Army Air Corps in the early 1930s. The B-5A was a Keystone...

The Keystone–Loening K-84 Commuter was a single-engine closed-cabin 4-place biplane amphibious flying boat built by Keystone–Loening. It was powered by...

Keystone Aircraft Corporation was an early American airplane manufacturer. Headquartered in Bristol, Pennsylvania, the company was formed as "Ogdensburg...

The Keystone B-4 was a biplane bomber, built by the Keystone Aircraft company for the United States Army Air Corps. Originally ordered by the United States...

The Keystone B-3A was a bomber aircraft developed for the United States Army Air Corps by Keystone Aircraft in the late 1920s. The B-3 was originally ordered...

The Keystone B-6 was a biplane bomber developed by the Keystone Aircraft company for the United States Army Air Corps. In 1931, the United States Army...

VIII Ford 4-AT-E Trimotor Interstate XTD3R Ireland N-2B Neptune Keystone XOK Keystone-Loening K-84 Commuter Koolhoven F.K.56 Lockheed Model 12B Electra...

Trainers TA-2 TA-6 TW-5 AT-1 AT-2 NK Patrol aircraft PK Observation aircraft XO-15 XOK Scout aircraft XS2L Names Air Yacht Commuter Pathfinder Pronto...

The Keystone LB-6 and LB-7 were 1920s American light bombers, built by the Keystone Aircraft company for the United States Army Air Corps, called Panther...

Prototypes were ordered from Keystone-Loening (then a subsidiary of Curtiss-Wright), Berliner-Joyce and Vought, and designated as the XOK-1, XOJ-1 and XO4U-1 respectively...

The Loening C-4C, later the Keystone-Loening K-85 Air Yacht following the merger of the Loening and Keystone companies, was an amphibious utility biplane...

The Keystone K-78 Patrician was an airliner developed in the United States in the late 1920s, built only in prototype form. The Patrician was a high-wing...

variants of the PN were built for the United States Navy by Douglas, Keystone and Martin. The PN flying boats were twin-engine biplanes with their engines...

The Keystone K-55 Pronto was a mail plane developed in the United States in the late 1920s. The Pronto was a conventional single-bay, unequal-span biplane...

The Keystone K-47 Pathfinder was an airliner developed in the United States in the late 1920s, built only in prototype form. The Pathfinder was an attempt...

Huff-Daland Division of the Keystone Aircraft Corporation. A single example of the Huff-Daland XB-1 bomber became the Keystone XB-1B, after its original...

The Keystone LB-5 (originally ordered under the Huff-Daland name) was a bomber aircraft produced in the United States in the late 1920s. Its manufacturer...

of its time at 221 mph. Total airframe flight time 33 hours. 15 April Keystone XOK-1, BuNo A-8357, disintegrates in dive during tests this date, during...

The Keystone NK or Keystone Pup was a two-seat biplane trainer built by Keystone Aircraft for the United States Navy. The NK was an open-cockpit two-seat...

third type of "lightweight" observation aircraft designs, along with the Keystone XOK-1 and the Berliner-Joyce XOJ-1, both of which were built to BuAer Design...

The Keystone XO-15 was an American prototype observation aircraft, built by the Keystone Aircraft Corporation for the United States Army Air Corps, First...

The Keystone XLB-3 (originally built under the Huff-Daland name) was a prototype bomber biplane developed in the United States in the late 1920s. It was...

Trainers TA-2 TA-6 TW-5 AT-1 AT-2 NK Patrol aircraft PK Observation aircraft XO-15 XOK Scout aircraft XS2L Names Air Yacht Commuter Pathfinder Pronto...

Trainer AT-1. In 1927, Huff-Daland Aero Corporation became a division of Keystone Aircraft Corporation. Versions of the AT-1 were built for the United States...

Trainers TA-2 TA-6 TW-5 AT-1 AT-2 NK Patrol aircraft PK Observation aircraft XO-15 XOK Scout aircraft XS2L Names Air Yacht Commuter Pathfinder Pronto...

Trainers TA-2 TA-6 TW-5 AT-1 AT-2 NK Patrol aircraft PK Observation aircraft XO-15 XOK Scout aircraft XS2L Names Air Yacht Commuter Pathfinder Pronto...

Trainers TA-2 TA-6 TW-5 AT-1 AT-2 NK Patrol aircraft PK Observation aircraft XO-15 XOK Scout aircraft XS2L Names Air Yacht Commuter Pathfinder Pronto...