FlyBE is an interesting company to me. They are the epitome of a regional small airline in what they do and with what they do they can't make money.
Other larger airlines hide their problems with regional routes or justify the regional routes being unprofitable by saying they feed in to their larger network.
I think FlyBE need 100 seater turboprops to make the model work and 90 to 100 seater turboprops don't exist.
Q400 can supposedly fit 90 at a 28" pitch but you will usually be paying a premium to fly instead of bus, car, train so you wouldn't tolerate a 28" pitch to fly from Scotland to London or whereever.