RAF Castle Donington was opened as a Royal Air Force station in 1943, during the Second World War. The airfield was equipped with three concrete runways, together with two hangars, and was a satellite airfield to RAF Wymeswold, situated some 9 miles (14 km) to the southeast. Initially, the airfield was used by the 28 Operational Training Unit, training RAF Bomber Command crews on the Vickers Wellington, and subsequently by the 108 Operational Training Unit, later renamed 1382 Transport Conversion Unit, training RAF Transport Command crews on the Douglas Dakota. The airfield closed and the air force station was decommissioned in 1946. A group of local government agencies bought the former RAF station site in 1964, at which point a sizeable construction and runway investment programme was launched. The airfield was renamed East Midlands Airport to reflect the area it served, and it opened for passengers in April 1965, replacing the redundant Derby Airport. Until 1982, when the head office moved to Donington Hall, British Midland had its head office on the airport property. BMI also had its maintenance base at the airport. In 1993, National Express purchased the airport from the local councils. With Bournemouth Airport, it was sold to Manchester Airports Group in February 2001. In 2004 the airport was controversially renamed Nottingham East Midlands Airport. The change, however, did not last long, and on 8 December 2006, the airport's name was restored to East Midlands Airport. EasyJet ceased operating from the airport on 5 January 2010. However, it was announced on 13 April 2011 that Bmibaby would close its Manchester and Cardiff bases, moving an additional service to East Midlands Airport with increased frequencies and new routes for summer 2012. It was announced only just over a year later, on 3 May 2012, that Bmibaby would close down and cease all operations in September 2012, with a number of services being dropped from June. The parent company, International Airlines Group, cited heavy losses and the failure to find a suitable buyer as the reasons for the decision. In light of the announcement, Flybe and Monarch Airlines announced they would establish a base at the airport, and low-cost airline Jet2.com confirmed they would also expand their operations from the airport, with new routes and an additional aircraft from the summer of 2013. In 2015, the airport announced jet2.com would base a seventh aircraft at East Midlands Airport in the summer period. Ryanair expanded its East Midlands base with a series of new routes and frequency increases on existing routes. Ryanair became the largest airline at the airport, accounting for about 50% of passenger traffic, with East Midlands now being Ryanair's third-largest UK airport, after London Stansted and Manchester, both now also owned by MAG. In 2016, Heathrow handled 1.54 million tonnes of freight and mail, compared with 300,100 tonnes in East Midlands. DHL Aviation has a large purpose-built facility at EMA, and courier companies UPS and PostNL use the airport as a base to import and export freight. On 4 March 2020, Flybe entered administration, with EMA announcing that all flights were cancelled with immediate effect, the following day. In the summer of 2020, Aer Lingus announced they would commence flights to Belfast, operated by Stobart Air, taking over the route which was once operated by Flybe, until their collapse in early 2020. In June 2021, Stobart Air collapsed, ceasing the route. Later in the month, EasyJet announced they would take over the Belfast route, operating frequent flights to Belfast International Airport. This was the first easyJet route announced from East Midlands since they stopped services from the airport in January 2010.