Modern aircraft have become much quieter over the last two decades. The largest business jet operating at Centennial is remarkably quieter than one of the smallest. Aircraft are categorized by the amount of noise they make. The loudest are called Stage I and State II, which have been banned in the United States as of Dec. 31, 2015. Stage III and Stage IV aircraft are the quietest.  Aircraft at Centennial, now, meet Stage III requirements and some, even meet Stage IV standards.
Bye Aerospace is a world leader and innovator of electric aircraft. The company, which was founded in 2007 and is headquartered near Denver at Centennial Airport, is developing and flight testing prototypes of all-electric general aviation training, personal and business aircraft, focusing on advances in energy and design efficiencies.