Technical support (often shortened to tech support) refers to a plethora of services by which enterprises provide assistance to users of technology products such as mobile phones, televisions, computers, software products or other informatic, electronic or mechanical goods.
 In general, technical support services address specific problems with a product or service rather than the provision of training, customization, or other support services.
The Dresser-Rand business, part of German Siemens AG Power and Gas (PG), is a leading supplier of mission-critical, high-speed rotating equipment solutions to the worldwide oil, gas, petrochemical, and process industries.
 As part of the global Siemens family, the Dresser-Rand business offers an equipment portfolio that includes turbo and reciprocating compressors; steam turbines; industrial and aero-derivative gas turbines; high-speed engines; and modular power substations.
 With the world's largest installed base, one of the world's largest technical support and service center networks, and a presence in more than 150 countries worldwide, the Dresser-Rand business delivers local solutions and services on a global scale.
The ATR 42 is a twin-turboprop, short-haul regional airliner developed and manufactured in France and Italy by ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.).
 The number "42" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which typically varies between 40 and 52 passengers.
The ATR 72 is a twin-engine turboprop, short-haul regional airliner developed and produced in France and Italy by aircraft manufacturer ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.).
 The number "72" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which could seat 72-78 passengers in a single-class arrangement.
SAS Technical Services (STS) has changed name to SAS Tech.
 The company is owned by the SAS Group and provides technical maintenance of aircraft to airlines in and outside the SAS Group.
 The company is one of the world's 15 biggest providers of technical aircraft maintenance and the tenth biggest provider in Europe.
 SAS Tech has full-service contracts for nearly 250 aircraft.
 SAS Tech products cover line, base and heavy maintenance; component maintenance; engineering services; engine management; and maintenance training.
 It is headquartered at Arlanda outside Stockholm and has 3,600 employees.
AppleCare is Apple's brand name for extended warranty and technical support plans for their devices.
 Apple hardware normally has a one-year limited warranty and includes 90 days of technical support by telephone.
 Customers can obtain extended warranty coverage and technical support, which extends the length and expands the scope of coverage, by buying an AppleCare plan.
 The AppleCare Protection Plan is available for many Apple products including Mac computers and displays, iPhones and iPads, Apple Watches, and Apple TV.
 AppleCare plans include Apple software associated with the covered hardware.
 Customers can also buy additional support and training through AppleCare.
The Cessna 208 Caravan is an American single-engined turboprop, fixed-tricycle landing gear, short-haul regional airliner and utility aircraft that is built by Cessna.
 The airplane typically seats nine passengers with a single pilot, although with a FAR Part 23 waiver it can seat up to fourteen passengers.
 The aircraft is also used for cargo operations.
On 22 July 2016, an Antonov An-32 twin engine turboprop transport aircraft of the Indian Air Force disappeared while flying over the Bay of Bengal.
 The aircraft was en route from Tambaram Air Force Station in the city of Chennai on the western coastline of the Bay of Bengal to Port Blair in the Andaman and Nicobar Islands.
 There were 29 people on board.
 Radar contact with the aircraft was lost at 9:12am, 280 km east of Chennai.
 The search and rescue operation became India's largest search operation for a missing plane on the sea in history.
Air Tahoma Flight 185 was a scheduled cargo flight from Memphis to the Cincinnati/Northern Kentucky International Airport conducted by Air Tahoma as part of a contract to freight parcels for courier firm DHL.
 On August 13, 2004, the flight crashed during approach to landing just one mile short of the runway.
 The Convair 580, which is a twin engine turboprop, was destroyed upon impact.
 The first officer was killed and the captain received minor injuries.
AvCraft Technical Services was a Myrtle Beach, South Carolina U.S., based company that is the leading supplier of high quality cost-effective maintenance and technical support services for owners/operators of Bombardier Dash 8, ATR 42, ATR 72 and Fairchild Dornier 328 turboprop and jet aircraft.

Question: AvCraft Technical Services was the leading supplier of maintenance and technical support services for this twin engine turboprop, short-haul regional airliner.
Answer: ATR 72