RAT5, The memo we recieved is that there were a series of "high altitude upsets". The rumour mill has even suggested an approach to stall or stall itself. These are under investigation we are tld and until it has been resolved we have been instructed to fly at a lower level. I have my own theories and have heard certain stories, but as I recall there was an order from the owner of this site not to discuss certain isues about a certain airline due to legal hassles.