My flyingblue miles are going to expire in March next year, but obviously I'd like to keep 'm. In order to do so, I have to make a flight before that date. There's still some time left, but I have time in the next 6 weeks to do this. Does anyone know a trick/website/whatever to get a cheap one-way flight, or better a same-day return on a Skyteam carrier? Points of departure are AMS, DUS or BRU.