From a local web site. New Airline service
Blue Coast Aviation began operations here yesterday with a new flight route between Zihuatanejo, Acapulco and Chilpancingo on a 12-passenger Cessna 208. Tickets cost between 800 and 1000 pesos.
I couldn't find a website for them, though it is a brand new company so hopefully one is in the works. The only contact info I could find was the following:
Miguel del Valle Prieto Sarmiento
744 4 46 60 01 (telephone)
744 2 14 16 50 (cell phone)
They have a counter at the airport where you can obtain tickets and more info.