DJD,
received a similar letter, and have decided in turn to let QF know that they have made my top 5 list of employers. I also let them know that I will only be accepting interviews with my "top 3", which will not be decided until mid next year (mainly due to the Christmas break). I stated in my letter that the competition is very tough, and can offer no guarantee to the "top 3" stage. They now know that if I choose to let their application to be my employer go further, I shall notify them by mail by June next year. Of course if their situation was to change (order more A380's, or manage to flog more of themselves off to overseas investers) they are to notify me as soon as possible, as this could affect their chances, in what is a very tight contest between them and umm err...my "top 5".