Construction and opening

In 1928, Birmingham City Council decided that the city required a municipal airport; thus soon thereafter a committee was established to work towards establishing such a facility. By 1931, several locations, including Shirley, Elmdon and Aldridge, were reportedly under consideration as potential sites. While Elmdon was considered to be an impressive and appropriate site for the airport, further progress was delayed due to spending cutbacks that had been initiated as a consequence of the Great Depression. By 1933, the project was revived and a new airport committee was formed during the following year to oversee the airport's establishment. Prior to any major construction decisions being taken, members of the committee visited various successful airports around Europe in 1935, including Amsterdam, Berlin, Lyon, Paris, Brussels and London.

During January 1935, the airport committee approached British architectural and engineering practice Norman and Dawbarn, inviting their attendance and seeking their participation as expert advisers on the airport's construction, the practice was subsequently appointed as the project's architects. In 1933, Birmingham City Council authorised the compulsory purchase of 300 acres of land for the use by the airport; another 214 acres were similarly acquired during the following year. During 1936, a private bill presented by the Birmingham Corporation was passed through Parliament, which authorised the acquisition of further land as well as the diversion of various roads and footpaths to permit the airport's development. Shortly following the bill's passing, various agencies, including the City Engineer and Surveyor, the Public Works Department and a firm of aeronautical consultants, including Norman and Dawbarn, commenced work on preparing the ground, designing both the terminal and hangar buildings, and planning out the airport's detailed layout.

By January 1937, Norman and Dawbarn had been authorised to finalise the design drawings; these were apparently completed by June 1937. In October of that year, various contractors were appointed to construct various elements of the airport's buildings, including its elaborate terminal. Reportedly, the project's total expenditure amounted to around £360,000. Construction work proceeded at a rapid pace; on 1 May 1939, the airport had been completed to such a degree that it was ready to handle traffic.

On 8 July 1939, the Duchess of Kent, Princess Marina of Greece and Denmark, accompanied by the Prime Minister, Neville Chamberlain, officiated at the opening of Elmdon Airport. Its terminal, which incorporated the airport's air traffic control tower, was designed by Norman and Dawbarn in an Art Deco style; this facility would continue to be used as a terminal until 1984 and subsequently as staff offices and for private flights; it is still intact as of 2023. The airport was owned and operated by Birmingham City Council. Initial services flew to Croydon, Glasgow, Liverpool, Ryde, Shoreham, Manchester, and Southampton; further services were added soon thereafter, although its use as a civilian airport would soon be interrupted by the outbreak of the Second World War.

Second World War

During the Second World War, Elmdon Airport was requisitioned by the Air Ministry and was used by both the Royal Air Force (RAF) and the Royal Navy as RAF Elmdon. It was largely operated as an Elementary Flying School and a base for the Fleet Air Arm. It was during this era that the original grass airstrip was replaced by two hard runways: 06/24 at 2,469 feet (753 m) and 15/33 at 4,170 feet (1,271 m). Large numbers of Avro Lancaster and Stirling bombers were manufactured at the Austin Aero Company's shadow factory at Cofton Hackett, but were unable to take off from the short runways at Longbridge; thus, they were transported by road to RAF Elmdon, their wings being removed beforehand and re-attached after arrival. They were test flown from the aerodrome and, once declared airworthy, they were flown to their operational units. On 8 July 1946, the aerodrome was reopened to civilian operations, though it remained under government control.

1950 to 1980

During the post-war years, a number of public events, such as air fairs and air races, were held on the site. In 1949, scheduled services began with British European Airways (BEA) launching routes to Paris; the number of flights to the continent steadily grew over the years, including services to Zürich, Düsseldorf, Palma, Amsterdam and Barcelona commencing between 1955 and 1960. During 1960, the City of Birmingham resumed responsibility for the airport's operation again, ending central government control.

In 1961, an additional terminal building to handle the growing international traffic was opened, which was fittingly called The International Building. Furthermore, work to extend the airport's main runway to 7,400 feet (1.4 miles) was undertaken between 1967 and 1970, which permitted the launch of new services using turboprop and jet-powered airliners. Accordingly, a new service to New York using VC-10 airliner was launched during 1967.