The Macchi M.9 flying boat saw Italian military service just before the end of WWI. Nine examples were sold to Poland in 1921. The M.9bis featured an enclosed cabin with two passenger seats. It found favour with the Swiss operator Frick & Co, which was founded in September 1919 and soon renamed Ad Astra Aero. Pictured here on Lake Zurich, wearing the Macchi logo, this airframe received Swiss civil reg CH-19. Another one was CH-20. Photo from: ETH-Bibliothek Zürich

The first GMB delivered. Photo from: National Archives at College Park, Maryland

Photo appears to be taken at the Martin factory and airfield. They were tightly hemmed in by housing. Martin moved to Baltimore in 1929 and a new municipal airport was opened in 1925. 39057 was transferred to McCook Field where it was given the serial P72. Photo from: National Archives at College Park, Maryland

Possibly worst aircraft ever made. Designed by conman William Christmas it had a flexible wing that would "flap like a bird". First Bullet crashed when the wing detached on its maiden flight in 1918, killing the pilot. Christmas made a second one, the one in the photo, claiming at an expo in March 1919 the unflown aircraft had reached almost 200mph during testing. This Bullet fatally crashed out of control on its first flight. Christmas then left aviation having made a lot of money from the US Army Bullet contract. Photo from: National Archives at College Park, Maryland

One of Dayton Wright's projects to extend the life of DH-4 production after Armistice. The aircraft was stretched by a foot to make a cabin for two behind the pilot. One can only speculate why it was called the Honeymoon. How many were built is unknown but there may have been only one. A Honeymoon won the Aviation Country Club Trophy Race at Detroit in 1922. Photo from: National Archives at College Park, Maryland

The one and only T-4 Messenger. A single seater, contemporary reports say it started as a liaison aircraft for the army but switched to being a civil aircraft before the project was abandoned. Photo from: National Archives at College Park, Maryland

Confusingly, the Manchester II preceded the Mk1 due the unavailability of the intended ABC Dragonfly radial engine for the first aircraft. The project was cancelled without entering production. Avro photo. Photo from: Civil Aviation Historical Society, Melbourne, Australia

Some of the 400-odd DH-9's built by the National Aircraft Factory No.2 at Heaton Chapel, Stockport in 1918/19. D1389 is centre with painted fin. F357, a NAF No.2-built DH-10 twin engined bomber is upper centre right. From Manchester Airport Archive.