In the late 1970s and early 1980s, Singapore Airlines operated the Concorde on flights between Singapore and London, slashing flying times to under 10 hours for elite passengers. Despite catering to time-pressed business travelers, celebrities, and politicians, the service suffered from waning demand and rising fuel costs, leading to heavy losses. The venture was marked by political obstacles, such as Malaysia initially refusing overflight permissions. After negotiations and a series of setbacks, the Concorde service eventually resumed, allowing Singapore Airlines to offer unique advertising opportunities with the dual-liveried aircraft.
https://mainlymiles.com/2024/03/03/singapore-airlines-concorde-full-story/