ever since. On 25 March 2014 the company's first conforming Vision SF50 jet flew. Cirrus also indicated that it was continuing to hire engineers, technicians and designers for the jet program. From 2011 to 2014 Cirrus hired more than 300 new workers, bringing the total number of employees to over 800. In 2015, the company announced plans to expand to Knoxville, Tennessee and establish a customer delivery center there, which officially opened on 12 January 2017. On 28 October 2016, Cirrus received FAA type certification for the Vision SF50 very light jet, with deliveries beginning in December of that year in the company's new Duluth aircraft finishing facility. In April 2018, the company was named the 2017 winner of the Collier Trophy for the "greatest achievement in aeronautics or astronautics in America" in the past year. The trophy was awarded for "designing, certifying, and entering-into-service the Vision Jet — the world’s first single-engine general aviation personal jet aircraft with a whole airframe parachute system". By the end of 2019, Cirrus employed 1,600 people and produced 81 Vision Jets and 384 SR-series aircraft that year, resulting in the company's fifth year of growth and its best year in sales. The Vision SF50 became the world's best-selling general aviation jet. Products and industry firsts SR aircraft series The Cirrus SR (Single Reciprocating) Series aircraft (including the SRV, SR20, SR22 and SR22T) are produced with "Cirrus Perspective" by Garmin (and previously Avidyne Entegra) integrated digital flight displays and modern avionics as standard equipment, a first in the light general aviation (GA) manufacturing industry when the Entegra instrument panel became available on the series in 2003. The aircraft are all electric - no vacuum systems are used. Redundancy is provided by dual batteries and alternators. The series originally began as a four-seat aircraft, with a smaller fifth seat added in 2013. The SR22 is also available with TKS anti-icing equipment, which has enabled flight into known icing (FIKI) conditions since 2009. The SR aircraft series was the first of its kind to come equipped with flight envelope protection in the form of an electronic "level" button, as well as "airbag seatbelts", two airbags installed in the shoulder harnesses of both the pilot and co-pilots' seat belts. The series incorporates other unusual design elements. All SR-aircraft use a mechanical side yoke instead of the traditional yoke or stick flight controls, and a single power lever