CONTRACTED SERVICES Know when it's time to change contracted service provider AIRPORT GURU The accelerating danger of diesel exhaust fluid contamination FBO MATTERS How can FBOs effectively handle hundreds of aircraft types LANDSIDE \ TERMINAL / AIRFIELD ECONOMY INFLIGHT Across the country, general and business aviation airports are capitalizing on a strong American economy to grow and become the economic drivers of their region. www.AviationPros.com OCTOBER 2019http://www.AviationPros.com