Operated by Aero OY. Later OH-ALC. Photo from: Bernhard Åström / Society of Swedish Literature in Finland, SLS

Built in Marina di Pisa and powered by Rolls-Royce Eagles, ex I-DAAR. One of four Wals bought by Nordiska, a subsidiary of Deutscher Aero Lloyd, for its Danzig - Stockholm service. To Lufthansa in 1926. Used on the Stettin - Kalmar -Stockholm route, and between Bremerhaven and Heligoland in summer. D-861 visited Oslo in July 1927, and sank following an accident on 6 October 1931. Photo from: KB - National Library of the Netherlands

Middle part of panorama photo showing a line-up of five Potez XVII aircraft of the Bulgarian army. Towards the left is B-BPEK. Photo from: Lost Bulgaria

The Potez XVII was a variant of the Potez XV reconnaissance aircraft. Six or eight examples were supplied to Bulgaria and based at the main Bozhurishte airfield near Sofia. These military aircraft wore civilian registrations with the B repeated on the tailfin. Left part of a panaroma photo. On the right is B-BPEC. Photo from: Lost Bulgaria

The one and only Antelope which lost out to the Hawker Hart in a contest for light bomber for the RAF. Photo from: The Early Aviation Photograph Collection/The Museum of Flight

The Wizard was developed from a racing aircraft powered by Rolls Royce Falcon. After an accident, the Racer was rebuilt a fighter called the Wizard. The engine was a Rolls Royce F.XI soon to be called the Kestrel. Air Ministry interest led to a request to modify the aircraft to improve visibility for the pilot. The engine was also upgraded to a supercharged F.IX. When the modified aircraft, the Wizard II, had poorer performance than the Mk.I , it was decided to drop it because there was not enough gain over biplanes. Photo from: Imperial War Museums

The Witch was the one and only prototype of a bomber built to specification 23/25. None of the contenders were selected for production. The Witch found use testing parachutes until 1931. The location is likely to be RAF Andover where the Witch and other Westland military aircraft of this era made their first flights. Photo from: Imperial War Museums

This was the first Victoria IV, which had metal wings and Bristol Jupiter radial engines. 10 early models were given metal wings and a further three had a metal airframe under the designation Victoria IV. These aircraft retained their Napier Lion engines. J9250 crashed on March 29, 1931. Photo from: Imperial War Museums

S1146 was assigned to 47 Squadron for its second Cairo-Capetown-Cairo training flight. The aircraft had originally been allocated to the Fleet Air Arm, which was then part of the RAF, for training at RAF Gosport. Photo from: Imperial War Museums

The photo appears to shown the one and only Vickers 141 between its unsuccessful trials for the RAF fighter and its unsuccessful trials as a carrier based fighter for the Fleet Air Arm. Throughout all these trials it remained registered G-EBNQ, although it did not always display is civil registration. Photo from: Imperial War Museums

Prototype Vildebeest. Later G-ABGE and sold in Spain as EC-WII (painted as EC-WLL) in 1932. Photo from: Air Force Museum of New Zealand

The first evidence for this grass airfield is from 1927. This photo was taken in 1928 and the biplane is believed to be a Kreider-Reisner Challenger C-2 aircraft with a Kinner D-5 engine. It carries no visible markings. (This may be because, at the time, The State of Pennsylvania had jurisdiction over things aeronautical and issued aircraft license numbers in the format P-### .) In 1945, John Van Sant bought the Silver Star Airport and renamed it to the Old Star Airport. The airport closed about 1973 and the Oxford Valley Shopping Mall was built, obliterating its existence.

The prototype Bulldog II, probably pictured early in 1928 at Filton from where it was first flown by Cyril Uwins on 21 January. Photo from: Life

Stout's airline at first operated as Detroit-Grand Rapids Airline and Cleveland-Detroit Airline. This early Tri-Motor crashed near Toledo, Ohio on 16 January 1929 following an in-flight fire. The aircraft carried 2500 pounds of mail. Photo from: Cleveland Public Library

The sole Bellanca K was built for a transatlantic flight to Rome. Cesare Sabelli's crew took off from Old Orchard Beach, Maine on 20 September 1928 but returned with a loose piston and ditched. The aircraft was repaired but subsequent users also experienced engine problems: a flight from Argentina to Spain didn't happen, a record endurance flight failed due to high oil consumption and finally Thor Solberg ditched NX4864 off Newfoundland on his way to Norway on 23 August 1932. The odd design of the aircraft, with lifting surfaces forming a sort of W-shaped lower wing, was supposedly very efficient and led to the Model P Airbus/Aircruiser. Photo from: Smithsonian Institution

The second of six M.18 flying boats to serve in Portugal's navy from 1928 until about 1934. Flown from the factory in Varese to Lisbon in August-September 1928 - not straightforward without wheels. Photo from: Museu de Marinha (Portugal)

Photographed at one of the many small airports that dotted LA in the late 1930s. This one was operated by American Aircraft Corp, which was among other things a Waco agent. NC5013 (now N5013) is still registered in 2013. Photo from: University of Southern California

Photo showing what the hangars looked like at San Francisco - Mills Field almost 100 years ago. This is what would later become San Francisco International Airport (KSFO). Photographer unknown.

In 1927 construction pioneer Gottlob Espenlaub moved with his factory to Düsseldorf-Lohausen. In front of the company building D1570 (promoting the Dapolin gasoline brand) is parked together with Espenlaub E-11 D1183 and Espenlaub E-7, one of his glider-constructions. Mr Espenlaub later made tests with rocket propulsion. Picture taken by my late Grandfather.

in 1927 constructing pioneer Gottlob Espenlaub moved with his factory to Düsseldorf-Lohausen, here proudly presenting his machine to those interested ladies. Mr Espenlaub later made tests with rocket propulsion. Picture taken by my late Grandfather.