Circular presenting a description of the K 47 airplane, which is a two-seat aircraft created by the A.B. Flygindustri in Sweden. A description of the construction, design, interior, performance, visibility, wings, fuselage, controls, landing gear, engines, weapons, characteristics, drawings, and photographs are provided.

The F.170's engine has won world endurance tests in 1924 and in 1925. It has a semi-thick wing, rigidly braced by oblique struts. This wing is embedded in the top of the fuselage and measures 16.1 by 3.6 meters. The F.170 has a passenger compartment seating eight.

The S 64 is a large monoplane with an aspect ratio of 7. It has a cantilever wing made of a single piece, entirely of wood. The wing has three spars with a covering of plywood. The engine is mounted high over the wing's center. It was designed for long distance transatlantic flights.

Circular describing the Armstrong Whitworth XV "Atalanta" airplane, which is a commercial multiplace cantilever monoplane. Details of the wings, landing gear, fuselage, control surfaces, structural design, wing, engine, characteristics, drawings, and photographs are provided.

Describes the utility of multi-engine aircraft with special regard to the Argosy, which will seat up to 20 passengers and who's engines turn out nearly 1200 HP. The Argosy had a top speed of 110 MPH, and a range of 400 miles.

Circular describing the Avro 627 Hailplane, which is a single-seat biplane designed for delivering air mail. Details regarding the fuselage, wings, tail, landing gear, power installation, characteristics, performance, drawings, and photographs are provided.

Circular presenting a description of the Blériot 137, which is a metal modification of the Bléirot 127. A description of the crew, the equipment, firing tests of the guns, and flight characteristics are provided.

The Boeing Mail Airplane is a biplane with cloth covered wings of wood and wire construction, a top speed of 130 MPH, and a fuel capacity of 100 gallons in two tanks.

Circular presenting a description of the Breda 32, which is a commercial airplane with three engines and an all-metal construction. Details regarding the design, components, flight qualities, drawings, and photographs are provided.

Circular presenting a description of the Breguet 390 T, which is a three-engine all-metal transport sesquiplane with the same structural principles as the Breguet military airplane. This aircraft design replaces a girder fuselage with an orthodox rectangular fuselage with accommodations for ten passengers and baggage. Details of the design, components, flying qualities, drawings, and photographs are provided.

Circular presenting a description of the British Klemm "Eagle", which is a low-wing commercial cantilever monoplane. Details of the components, flying qualities, design characteristics, weights and loadings, drawings, and photographs are provided.

The Caproni 73 is a biplane with medium thick wings, a rigid central section, and with each lateral extension forming a single cell and is powered by two 500 Isotta Fraschini "Asso" Engines.

Report presenting a description of the Dyle and Bacalan D.B. 80 airplane, which can be used for delivering mail. Details of the wing, fuselage, tail, landing gear, fuel tanks, and flying qualities are provided.

Circular presenting a description of the Heinkel Airplane H.D. 39, which is a postal airplane that can be used to carry newspapers. Details regarding the design, controls, equipment arrangement, fuel, and flying characteristics are provided.

Circular presenting a description of the Heinkel HE 70 commercial airplane. Details of the fuselage, wing, tail surfaces, landing gear, power plant, instrumentation, flying qualities, and some photographs are provided.

The three engine Junkers commercial Airplane, type G 31 is a further development of the earlier G 24. It is an all metal low wing monoplane with a total engine output of 1100-1200 HP.

Circular describing the Levasseur 8, which is an adaptation of a naval airplane adopted by the French Navy. Details of the wings, fuselage, landing gear, fuel, engine, and flying qualities are provided.

The Parnall Pipit is a single-seat ships fighter equipped with a Rolls Royce "F" type engine and armed with two synchronized Vickers guns. It can also be configured to carry bombs under the wings.

Circular presenting the Valetta, which is a twin-float seaplane and flying boat with a power plant comprised of three Bristol "Jupiter" XI F geared engines. A description of the design, characteristics, performance, blueprints, and photographs are provided.

The S-38, model 28 is a nine passenger Sesquiplane powered by two Pratt and Whitney Wasp 410 HP engines and is intended for routes where the ability to take off and land from both land and water is essential. A description of the weight, construction, power plant, fuel system, landing gear, hull and floats, dimensions, flight characteristics, blueprints, and photographs are provided.

Circular describing the Spartan "Cruiser", which is a six-seat low-wing cantilever commercial monoplane with three engines. Details of the construction, fuselage, wing, tail unit, power plant, fuel system, lubrication system, landing gear, controls, cabin arrangement, characteristics, performance, drawings, and photographs are provided.

The Widgeon III is a parasol type monoplane. One of its strongest features was the high degree of visibility available to the pilot. A description of the design, construction, flight characteristics, blueprints, and photographs are provided.

Circular presenting a description of the Wibault 220 R.N. 3 airplane. A description of the design, fuselage, engines, flight characteristics, blueprints, and photographs are provided.