Singapore Airlines is the flag carrier of Singapore with its hub located at Changi Airport. A member of Star Alliance, the airline is notable for highlighting the Singapore Girl as its central figure in the corporate branding segment and not significantly changing its livery throughout its history. Widely renowned as one of the world's best carriers, the airline is ranked as a 5-star airline as well as ranked as the world's best airline by Skytrax five times. The airline operates a variety of Airbus and Boeing aircraft, namely the A350, A380, Boeing 737, Boeing 747 Freighter, Boeing 777 and Boeing 787, among others. Singapore Airlines Group has more than 20 subsidiaries, including numerous airline-related subsidiaries. SIA Engineering Company handles maintenance, repair and overhaul business across nine countries with a portfolio of 27 joint ventures including with Boeing and Rolls-Royce. Singapore Airlines Cargo operates SIA's freighter fleet and manages the cargo-hold capacity in SIA's passenger aircraft. Scoot, a wholly owned subsidiary, operates as a low-cost carrier. Wikipedia