RONKONKOMA - Islip Town Supervisor Tom Croci today announced that he and the town board have decided to replace MacArthur Airport Commissioner Teresa Rizzuto.Rizzuto served as commissioner for nearly five years and was praised by the previous town supervisor, but Croci says her leadership is to blame for a drop in daily flights.Rizzuto declined an interview but released a statement blaming the lower number of flights on the recession and turmoil in the airline industry.Croci says he'll unveil a proposed 10-year master plan next month, calling for a sweeping modernization of the airport. Hearings on the plan will begin in July.