Link Frontier will ax Philadelphia, Sacramento, Louisville and Akron-Canton airports from its route map. The moves are part of continuing route shake-up at the struggling carrier, which is in the midst of an attempt to reinvent itself under the ownership of parent company Republic Airways. Service to those cities along with flights to Provo, Utah will end the first week of January. Frontier spokeswoman Lindsey Carpenter tells The Denver Post the decision to drop the cities "is based on the business model and the performance metrics of the route itself." In a move the partially offsets the elimination of Akron-Canton, Frontier announced it will begin flying from its Denver hub to Cleveland beginning Jan. 9. Frontier already offers some charter flights from Cleveland, part of packages sold through Apple Vacations, according to WEWS TV of Cleveland.