The Fuerteventura has been advertised for 2 years running now but has never actually happened. Personally I don't think there is sufficient demand for an FUE from HUY in the summer months, in the winter, maybe.
Malta was served a few years back for several summer and winter seasons. There is undoubtedly a market for a HUY-MLA flight however, Thomson are offering a BY operated flight from nearby DSA, so the market is again diluted further.
There is a (somtimes proven) market for flights from HUY to Malaga, Funchal, Monastir, Malta, Varna, Corfu, Rhodes and Paphos at least, however with DSA on the scene, it is unlikely HUY's summer charter programme will gain many new flights in the future.
Regards
Mike