Avro Canada in Toronto worked unsuccessfully to develop the fire-control computer for the Velvet Glove air-to-air missile for the highly advanced but ill-fated Avro Canada CF-105 Arrow interceptor. Avro Canada made extensive use of computers in calculations for aircraft design and manufacturing processes, including CNC. Other military developers included the Royal Canadian Navy with its DATAR system for the command and control of warships. In the 1950s the Pinetree, Mid-Canada and DEW Line air-defence radar chains built across Canada relied heavily on computers. Certainly the largest and most powerful computer in Canada at the time was the IBM/USAF developed AN/FSQ-7, installed in the late 1950s, underground at RCAF Station North Bay, as the "brain" of the DEW Line System. The machine contained 55,000 vacuum tubes, weighed 275 tons and occupied a half-acre of floor space. It could perform 75,000 instructions per second. By 1958 there were 41 computers in operation in Canada with big business, universities or the military. The most popular was the IBM 650, which was used by 19 organizations, including Canadair Limited, Canadian General Electric, Ford Motor Company of Canada, Great West Life Assurance Company, Imperial Oil Limited, Orenda Engines Limited and the University of Toronto. Other models in use included the Bendix G-15, 4, the ALWAC III-E, 3, the IBM 705, 3, the UNIVAC II, 3, the Datatron 205, 2, the LGP-30, 2, the Borroughs E 101, 1, the IBM 704, 1, and the NRC 102A/D. One of the first commercial users of computers was Trans-Canada Airlines (TCA). In 1961 Ferranti-Packard developed the ReserVec computer reservation system for TCA (now Air Canada). This formed the basis for the Ferranti-Packard 6000 computer, and in 1963 two were sold in Canada, one to the Defence Research Establishment Atlantic, in Dartmouth, Nova Scotia and the other to the Toronto Stock Exchange. In 1961 the Royal Bank of Canada was the first bank in Canada to introduce computers for its operations, followed by the Toronto-Dominion Bank in 1962. It was soon followed by the other large Canadian banks, including the Canadian Imperial Bank of Commerce and Bank of Nova Scotia. When they introduced the credit card about the same time these records were kept on large central computers as well.