Thanks very much for the pointers and information. Actually, it will be a question of going to the airport, rather than taking the bus from the airport. So I hope all vending machines can sell the airport ticket. I will be starting from the Hilton Garden Inn at Berckmannsstraat 128. But this is a racket, isn't it? There's no way the airport bus ticket cost so much when I was last there. Having said that, I really liked jumping on and off buses and metro in Brussels.