David Russell Williams (born March 7, 1963) is an English-born Canadian, convicted murderer, rapist, and former Colonel in the Canadian Forces.
 From July 2009 until his arrest in February 2010, he commanded CFB Trenton, a hub for air transport operations in Canada and abroad and the country's largest military airbase.
 Williams was also a decorated military pilot who had flown Canadian Forces VIP aircraft for dignitaries such as Queen Elizabeth II, Prince Philip, and the Governor General and Prime Minister of Canada.
Canadian Forces Base Trenton (IATA: YTR, ICAO: CYTR) (also CFB Trenton) is a Canadian Forces base located within the city of Quinte West, Ontario.
 It is operated as an air force base by the Royal Canadian Air Force (RCAF) and is the hub for air transport operations in Canada and abroad.
 Its primary RCAF lodger unit is 8 Wing, commonly referred to as 8 Wing Trenton.
Cold North Killers: Canadian Serial Murder is a 2012 Canadian non-fiction book written by Lee Mellor and published by Dundurn Press.
 It documents the lives of sixty Canadian serial killers, with the earliest being Edward H. Rulloff and the most recent being Russell Williams.
 The book uses Katherine Ramsland's interpretation of what constitutes a serial killer—someone who has killed at least two people on two separate occasions, and who attempted to or likely would have killed again—as outlined in her 2007 book "The Human Predator".
 "Cold North Killer's" own definition of what constitutes a Canadian serial killer includes both Canadians who committed murder abroad (such as Keith Hunter Jesperson and Gordon Stewart Northcott) and non-Canadians who committed murder in Canada (like William Dean Christenson and Earle Nelson).
Wayne Clifford Boden (c. 1948 – 27 March 2006) was a Canadian serial killer and rapist active between 1969 and 1971.
 He was raised in Dundas, Ontario, near Hamilton.
 He earned the nickname "The Vampire Rapist" because he had the penchant of biting the breasts of his victims, a modus operandi that led to his conviction due to forensic odontological evidence.
 His was the first such conviction in North America, several years before Ted Bundy, another serial killer.
General aviation in the United Kingdom has been defined as a civil aircraft operation other than a commercial air transport flight operating to a schedule or military aviation.
 Although the International Civil Aviation Organization (ICAO) excludes any form of remunerated aviation from its definition, some commercial operations are often included within the scope of general aviation (GA) in the UK.
 The sector operates business jets, rotorcraft, piston and jet-engined fixed-wing aircraft, gliders of all descriptions, and lighter than air craft.
 Public transport operations include business (or corporate) aviation and air taxi services, and account for nearly half of the economic contribution made by the sector.
 Other commercial GA activities are aerial work, such as surveying and air ambulances, and flight training, which plays an important role in the supply of pilots to the commercial air transport (CAT) industry.
 Private flying is conducted for personal transport and recreation.
 It includes a strong vintage aircraft movement, and encompasses a range of air sports, such as racing, aerobatics, and parachuting, at which British teams and individuals have succeeded in international competition.
Cody Alan Legebekoff (born  1990 ) is a Canadian serial killer convicted in 2014 by the British Columbia Supreme Court of murdering three women and a teenage girl, between 2009 and 2010, in or near the City of Prince George, British Columbia.
 This trial of one of Canada's youngest serial killers drew national attention.
Sustainable transport refers to the broad subject of transport that is sustainable in the senses of social, environmental and climate impacts and the ability to, in the global scope, supply the source energy indefinitely.
 Components for evaluating sustainability include the particular vehicles used for road, water or air transport; the source of energy; and the infrastructure used to accommodate the transport (roads, railways, airways, waterways, canals and terminals).
 Another component for evaluation is pipelines for transporting liquid or gas materials.
 Transport operations and logistics as well as transit-oriented development are also involved in evaluation.
 Transportation sustainability is largely being measured by transportation system effectiveness and efficiency as well as the environmental and climate impacts of the system.
Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple.
 They are believed to have killed as many as 20 women during their murderous spree between 1947 and 1949.
 After their arrest and trial for serial murder in 1949, they became known as "The Lonely Hearts Killers" for meeting their unsuspecting victims through lonely hearts ads.
 A number of films and television shows are based on this case.
The Hwaseong serial murder (Hangul: 화성 연쇄 살인 사건 ; Hanja: 華城連鎖殺人事件 ; RR: "hwaseong yeonswae sarin sageon " ) is an unsolved serial murder case that occurred in the South Korean city of Hwaseong between September 15, 1986 and April 3, 1991.
 In each case, a woman or girl was found bound and murdered.
 The murder is considered to be the most infamous in the modern history of South Korea and has been compared to the Zodiac Killer.
Hunting-Clan Air Transport was a wholly private, British independent airline that was founded in the immediate post-World War II period.
 It began trading on January 1, 1946 as Hunting Air Travel Ltd.
 It was a subsidiary of the Hunting Group of companies, which had come from the shipping industry and could trace its history back to the 19th century.
 The newly formed airline's first operating base was at Bovingdon Airport in Southeast England.
 Its main activities were contract, scheduled and non-scheduled domestic and international air services that were initially operated with Douglas Dakota and Vickers Viking piston airliners from the company's Bovingdon base.
 A change of name to Hunting Air Transport occurred in 1951.
 By that time, the airline had emerged as one of the healthiest and most securely financed independent airlines in Britain.
 In October 1953, the firm's name changed to Hunting-Clan Air Transport, as a result of an agreement between the Hunting Group and the Clan Line group of companies to invest £500,000 each in a new company named Hunting-Clan Air Holdings Ltd, the holding company for the combined group's air transport interests.
 Apart from Hunting-Clan Air Transport itself, this included Field Aircraft Services Ltd, the Hunting group's aircraft maintenance arm.
 In 1960, Hunting-Clan Air Transport merged with the Airwork group to form British United Airways (BUA).

Question: Which air transport operations hub was commanded by the most recent serial killer profiled in the book Cold North Killers: Canadian Serial Murder?
Answer: CFB Trenton