Question: Where is the head quarter of the Swedish airline which operates all the flights of BRA Braathens Regional Airlines with Braathens Regional Airways?

Context articles: Braathens Regional Aviation
Kullaflyg
BRA Braathens Regional Airlines
Trollhättan–Vänersborg Airport
Sundsvallsflyg
Sverigeflyg
Braathens Regional Airways
History of Braathens SAFE (1946–93)
Braathens
History of Braathens (1994–2004)

Braathens Regional Aviation is a Swedish airline headquartered in Malmö operating aircraft wet-leasing services together with its sister airline Braathens Regional Airways for BRA Braathens Regional Airlines.
Kullaflyg was an airline based in Ängelholm/Helsingborg, Sweden.
 They lease aircraft and pilots from the sister company Braathens Regional.
 Their own staff works partly as ground personnel and as cabin crew on the aircraft.
 As all subsidiaries of Sverigeflyg, Kullaflyg uses the callsign and codes of Braathens Regional.
BRA Braathens Regional Airlines is a virtual airline founded in 2016 and one of the largest domestic airlines in Sweden.
 The actual operators of all of its flights however are its sister companies Braathens Regional Airways and Braathens Regional Aviation.
 The brand BRA is the successor of Malmö Aviation and Sverigeflyg and the company has its headquarters in Stockholm.
Trollhättan-Vänersborg Airport (IATA: THN, ICAO: ESGT) is a small regional airport situated outside Trollhättan, Sweden.
 Braathens Regional Airlines (BRA) has its corporate head office on the airport property.
Sundsvallsflyg was a small regional airline based in Sundsvall, Sweden.
 Their own staff worked partly as ground personnel and as cabin crew on the aircraft, which were operated by Braathens Regional.
 Sundsvallflyg was part of the now dissolved brand Sverigeflyg which incorporated several small domestic airlines.
Sverigeflyg was the main brand for the seven Swedish regional airlines Blekingeflyg, Flysmaland, Golden Air, Gotlandsflyg, Kalmarflyg, Kullaflyg, and Sundsvallsflyg.
 The actual air operator of all of their flights however was Braathens Regional.
 In March 2016, Sverigeflyg and Malmö Aviation merged into the new BRA Braathens Regional Airlines.
Braathens Regional Airways AB (previously "Golden Air" and "Braathens Regional") is a Swedish airline with its head office in Trollhättan.
 It operates ACMI services between several domestic destinations within Sweden for its sister company and virtual airline BRA Braathens Regional Airlines and ad hoc charter services.
Braathens South American & Far East Airtransport A/S or Braathens SAFE was founded by ship-owner Ludvig G. Braathen in 1946.
 It started as a charter airline based at Oslo Airport, Gardermoen in Norway, flying to destinations in the Far East and in South America.
 At first the airline used Douglas DC-4s, and later also Douglas DC-3s.
 In 1948, the airline moved to Oslo Airport, Fornebu and started regular scheduled flights to the Far East.
 In 1952, the airline started cooperation with the Icelandic airline Loftleidir, where until 1960 the two airlines in cooperation flew flights to Reykjavík.
 Domestic services started in 1951, using de Havilland Herons on a route from Oslo to Stavanger via Tønsberg.
 Braathens SAFE also established at Stavanger Airport, Sola.
 A second route was started two years later to Trondheim.
 The Heron routes also stopped in Farsund, Kristiansand, Notodden to Stavanger and Hamar, Røros to Trondheim.
Braathens ASA, until 1997 Braathens South American & Far East Airtransport A/S and trading as Braathens SAFE, was a Norwegian airline which operated from 1946 until it merged with Scandinavian Airlines Norway (SAS) in 2004 to become SAS Braathens.
 For most of its history, Braathens was the largest domestic airline in Norway, but did not operate an international network for many years.
 Its main hubs were Oslo Airport, Fornebu and later Oslo Airport, Gardermoen, and briefly Stockholm-Arlanda Airport.
 The airline operated 118 aircraft of 15 models, the majority of aircraft which have been variations of the Boeing 737.
 Braathens served 53 airports and 50 cities with scheduled services through its history.
Braathens SAFE's domestic market was deregulated on 1 April 1994.
 Since then, any airline within the European Economic Area is free to operate any domestic or international route.
 Braathens rejected a proposal from the main competitor Scandinavian Airlines System (SAS) for a merger; instead the helicopter division was sold and the company listed on the Oslo Stock Exchange.
 New routes were opened from Oslo Airport, Fornebu to Bodø, Harstad/Narvik and Tromsø, but the routes from Bergen to these cities were terminated.
 International routes to Rome, Nice and Jersey were introduced.
 In 1996, Braathens SAFE bought Sweden's second-largest airline, Transwede, and started flying on the Oslo–Stockholm route.
 The following year, Transwede, with its five domestic routes, was merged into Braathens SAFE.
 The same year, KLM bought 30% of Braathens SAFE and the airlines started a partnership.