correct, but it's not (only) the unit cost but mainly the fuel costs that made most regional jet redundant.
Dani, excuse me I meant costs per unit, so more all costs per seatmile. Crew, write off, fuell, landing rights, maintenance etc.
What would the target cruise true airspeed be? Chornedsnorkack, the regional jets are pretty fast enabling them to do significant distances. I guess an aircraft bringing down cost would be slower, like a Q400 or even lower making it less suitable for longer flights.