My company regularly flies passengers to a different destination, and then busses them to their original destination so that the company can postition aircraft for maintenance swaps and so on. I can imagine that the passengers are mightily upset: I would be! I have no idea at what point they tell the passnegers that they aren't going to where they had booked to go, or what they tell them. I only know that the changes to destination are from abroad to the UK, and the destinations are within 50 miles of each other, anly 35 minutes or so by road, but that's enough to add about 1 1/2 hours or so to a journey. As I say, I would be a bit perplexed if it happened to me as a passenger.