What is the fine-grained topic of the following text: Air Senegal won't be able to launch its first long-haul route between Dakar and Paris CDG with its new Airbus A330neo as it was planned before due to production problems with the Rolls-Royce Trent 7000 engines. Only return the topic.
Air Senegal's delay in launching its long-haul route due to Rolls-Royce Trent 7000 engines production problems.