Royal Brunei Airlines Sdn Bhd (Malay: Penerbangan DiRaja Brunei, Jawi: ڤنربڠن دراج بروني), or RB, is the national flag carrier airline of Brunei Darussalam, headquartered in the RB Plaza in Bandar Seri Begawan. It is wholly owned by the government of Brunei. Its hub is Brunei International Airport in Berakas, just to the north of Bandar Seri Begawan, the capital of Brunei.

Formed in 1974 with an initial fleet of two Boeing 737-200 aircraft, serving Singapore, Hong Kong, Kota Kinabalu and Kuching, Royal Brunei Airlines now operates a fleet of 10 aircraft to 16 destinations in Southeast Asia, the Middle East, Europe, and Australia. Its fleet and type numbers increased dramatically in the 1990s.

Royal Brunei Airlines was established on 18 November 1974 with two new Boeing 737-200s. The airline's maiden voyage was on 14 May 1975 from the newly built Brunei International Airport to Singapore. Flights to the then British colony of Hong Kong and the city of Kota Kinabalu and Kuching in East Malaysia (Malaysian Borneo) started the same day.

Early route expansion included services to Manila in 1976, and Bangkok in 1977. Three years later, Royal Brunei acquired a Boeing 737-200QC – its third Boeing 737 – enabling it to reach Kuala Lumpur in 1981 and Darwin in 1983.

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