Brussels South Charleroi, the most accessible airport in Belgium, welcomes on Saturday 5 December 2009 the return of the Earth Challenge WWF pilots. The ULM will land between 2pm and 3pm at the airport. The Earth Challenge WWF has been a major success in the world of aeronautics. Under the supervision of meteorologist Luc Trullemans, 7 pilots have covered 28,000 kilometres between Sidney, Australia and Belgium. They have flown over about 20 different countries.