Royal Brunei Catering operates a number of restaurants, private function caterings, an aircraft catering facility at the Brunei International Airport and fast food outlets in the country, as well as a computerised laundry service. It earned formal recognition in 1995/96 with an award for Best Regional Caterer from Singapore Airlines.

Royal Brunei Trading is the operator of the Duty Free Shop at Brunei International Airport. It has also joined venture with Royal Sport House Singapore to open Royal Sport House in Brunei. Royal Brunei Trading are also the majority shareholders of McDonalds in Brunei through their investment in Golden Arches Sdn Bhd.

Mulaut Abattoir Sdn. Bhd., privatised in August 1990, provides convenient, hygienic and Islamic-sanctioned slaughtering facilities to local farmers and butchers, as well as for the Islamic rituals of Qurban, Aqiqah and other religious ceremonies. The abattoir also sells halal meat to the public and caters the airline’s inflight catering needs.

Abacus Distribution Systems (B) Sdn. Bhd. is one of Abacus International many National Marketing Companies in 24 markets across Asia-Pacific. Established in August 1990, Abacus Brunei is jointly owned by Royal Brunei Airlines and Abacus International, the Asia-Pacific's leading travel facilitator. Abacus provides travel information and reservations specifically tailored to the Asia-Pacific region. Abacus Brunei currently has some 30 travel agents with more than 140 terminals in Brunei Darussalam.

RBA Golf Club Sdn. Bhd. is an 18-hole golf course complete with its own driving range. It is situated next to the Royal Brunei Sports Complex near the Brunei International Airport.

Brunei International Air Cargo Centre (BIACC) is a joint-venture company set up in January 2001 between Royal Brunei Airlines as the majority shareholder, Circle Freight International and Royal Brunei Technical Services to handle air cargo activities into and out of Brunei. BIACC aims to complement and support the efforts and aspirations of His Majesty’s government to make Brunei the Service Hub of Trade and Tourism in the region.