This must be burning through a load of Stobart's cash and can't go on indefinitely i'd have thought. They've obviously bought/leased some proper dogs which is killing the viability of their operation. A shame really as the whole setup at SEN is good and is a decent option for getting to London.
Although having never been involved in it, there is an industry in itself of advising on buying and selling aircraft and aircraft engines. When you look at the "ownership" of some aeroplanes it amazes me how many banks/folks have an interest in them. I don't think it's that easy just to trade it in with Flybe for another one.