‘ C. After December 31, 2008, the department may not issue an annual registration certificate under section 51 to any airport whose airport manager designated under paragraph A has not completed training under this paragraph. The department, in consultation with a Maine airport managers association, shall establish and provide a training program for all airport managers designated pursuant to paragraph A. The commissioner, in consultation with a Maine airport managers association, shall determine the level of training necessary for the airport manager designee. Levels of training are based upon the classification of airports pursuant to subsection 1. The commissioner may determine that training completed by an airport manager through a national association of airport executives satisfies the requirements under this paragraph.’