With no US register in place, the US Post Office assigned its own aircraft serials and many DH.4s were in the 60 to 110 range. The name Ak-Sar-Ben is Nebraska reversed; this airfield was funded by the so-called Knights of Ak-Sar-Ben. Photo dated 'circa 1927' by the Smithsonian's National Postal Museum, but in fact the mail service moved to Fort Crook in 1924. The first mailplane, DH.4 No 105, arrived at Ak-Sar-Ben Field from Chicago on 5 January 1920. At that time the hangar carried a smaller sign saying 'Post Office Dept'. Photo from: Smithsonian Institution

One of 4,840 built in the USA under licence from de Havilland and is one of two original examples known to survive.

Del 02 Oct 1917 Preserved at Fantasy of Flight Aviation Museum Polk City, FL.

Dayton Wright built thousands of DH-4s under licence. Photo from: National Archives at College Park, Maryland

This the 1000th DH-4 built by Dayton Wright, the photo taken on the day it was due to be shipped to France. Photo from: National Archives at College Park, Maryland

Withdrawn from use at the end of 1928. Photo from: Library and Archives Canada

Became G-CYEC , an Air Board registration. The Air Board was an ostensibly civil organisation that fulfilled the role of an air force. The arrival of combat aircraft in the mid 1920s led to a dedicated Canadian air force and the eventual takeover of many Air Board aircraft. G-CYEC was struck off charge in 1928 before this happened. Photo from: Library and Archive Canada

Struck off charge in 1928. Photo from: Library and Archives Canada

Struck off charge in December 1924. Photo from: Library and Archives Canada

Part of the Imperial Gift which were aircraft supplied to British Empire nations to start air forces after World War I. A7929 was broken up in 1930. Photo from: RNZAF/Air Force Museum of New Zealand

G-AUBZ had a remarkably long career for an aircraft of its era. Registered in 1921, it was around long enough to became VH-UBZ. It was initially owned by legendary pilot Ray Parer, then went to Qantas and on to Matthews Aviation at Essendon. It remained in use into the late 1930s before being struck off the register in 1940, Photo from: National Library of Australia

Dayton-Wright built DH-4 32517 has been restored by the non-profit Friends of Jenny organization. Their aim is to fly the aircraft again after re-building the Liberty engine.

Originally with Qantas as G-AUBZ. Sold to Matthews Aviation in December 1927. Was still marked G-AUBZ at the start of 1930 despite a CAB directive to change it to VH-UBZ. That happened in March. At the time the aircraft had open cockpits (five) and was named "The Lachlan". Sold to Pioneer Aviation Services in 1931. At some stage the rear cockpits were replaced by an enclosed cabin. At least five (excited!) passengers are visible in this photo. -UBZ was finally struck off the register in 1940.

This was the first DH-4 to be manufactured under license in the United States by the Dayton-Wright Airplane Company of Dayton, Ohio. Used for flight testing in the United States during World War I, it was donated to the Smithsonian in 1919 and restored by the National Air and Space Museum at the Silver Hill Facility in Maryland from 1980 to 1981. It is now on display at the National Air and Space Museum in Washington, D.C.

G-AUCM was one of the first Australian civil aircraft and was registered in 1921 after service with the Royal Air Force as F2691. It is not known who owned it when it was photographed at Albury but by the end of 1927 it was in Papua New Guinea. G-AUCM was withdrawn from use in 1930 without adopting the VH- prefix (it would have been VH-UCM). Alexandra Park still exists in Albury and is about a kilometre from today's Albury Airport. The photo was found at a garage sale in Albury and the photographer is not known. The details were pencilled on the back.