If they sent say the Embraer 170 in there, you need to fill at least 62% to break even (based on running costs, and according to their data on Embraer's website)
However it is unrealistic to think that it would happen, so they flights would only... "Possbily" work if they only flew say Monday Return Service, and a Friday Return Service...
I cant see the plane filling for them to do it everyday...
Embraer Commercial Jets