When I asked them they said there wasn't enough demand. Personally I would be surprised if that is totally true, because around Christmas time it is difficult to get flights to Brazil at all. They get snapped up pretty quickly, and direct flights to the north-east of Brazil are sought after as there isn't generally enough.
It's pretty tiresome if you have to go to Maceio via Rio or Sao Paulo. Basically you cross the Atlantic, cross the Brazilian coast pretty close to Maceio. Four hours later you arrive in Rio or Sao Paulo. Wait for the connecting flight and fly four hours back up again! What a waste of life!