For all its worth An ATR72 500 has payload less than a Q400 of nearly 7 tons, That is probably why the carry on weight and checking weight vary From FlyBe. Arann do not charge for bags checked in like alot of other carriers. You are aloud to carry 22kgs with Are Arann, 15 check in and 7 hand, I think that is suffecient for the busniess pax on such a short route.
P.s. I hope these last few post will be moved to SLF