What's the likelihood that you would stay on with Cargolux AFTER the one year stipulated by your contract? What do you need to do to stay there? How much flight time are you guaranteed for that one year (for the cash that you paid)?
I hear the 400 is a great airplane to fly - and flying for Cargolux would allow you to see the world. But I also hear those pilots fly A LOT - good luck!