Besides, if it was originally planned to use a Monarch aircraft on the service but it went tech, would you have refused to get on the sub-charter just because it wasn't a Monarch aircraft?
deepknight, to me that's quite a different issue - one accepts that ad hoc charters may happen to any airline due to a/c becoming unserviceable etc.
But this is a series of planned sub charters. From the information on this thread there seems to be some disagreement as to whether the passengers were informed at the time of booking.
I hear everything you say about tight margins in the charter industry but, as a customer, am not too interested. If I book to fly on XXX airline then that is the airline I expect to fly on unless there are extenuating circumstances.