Also drop the baggage fee ripoff. In fact award customers bonus frequent flyer miles if they check their bags. Also on fair weather days allow dual boarding—thats is passengers who are seated in the back of the plane have an option to use the portable stairs to board thru the rear door on the larger aircraft.
I would reverse the current baggage fee structure, checked bags are free, and charge for carry ons. This would have to speed up the boarding process.