the DC-4); Douglas DC-4s then took over in 1951 followed by Douglas DC-6Bs in 1953. Flights to Lima, Peru started in 1953 (extended to Buenos Aires in 1956) and to Amsterdam in 1955. In August 1956 three Douglas DC-6B flights a week departed Vancouver for Amsterdam, with two flights departing for Tokyo and Hong Kong, one flight to Auckland, one flight to Sydney, and one flight to Buenos Aires. Several of the key routes in the early days were as follows: Flight numbers 1 & 2, flying Hong Kong – Tokyo – Vancouver – Edmonton – Winnipeg – Toronto – Montreal Flights 301/302, flying Sydney – Nadi – Honolulu – Vancouver – Edmonton, and non-stop via the Polar route to Amsterdam. Other flights to Europe included Lisbon, Milan, Rome, and Athens. Flights 401/402, flying Vancouver, Mexico City, Lima, Santiago and Buenos Aires Flights 501/502, Mexico City – Toronto – Santa Maria (Azores) – Lisbon – Madrid Other routes duplicated parts of the above, but from the 1959 Intercontinental Timetable these appear to be the main routes, and show the inventiveness that Canadian Pacific Airlines needed to employ and how they developed other overseas routes for Canada. The airline was flying DC-4s and DC-6Bs internationally in the 1950s, introducing turboprop Bristol Britannia aircraft in 1958. Douglas DC-8 jetliners began to replace them from 1961, but the Britannias continued on routes that were unsuitable for the new jets well into the 1960s – for example on the route to New Zealand until Whenuapai closed to civil traffic in November 1965. The big Britannia propjet was also used to fly non-stop service from Windsor, Ontario to Mexico City with this flight originating in Toronto before being replaced by a DC-8. Closer to home, non-stop Boeing 737-200 service from Vancouver to San Francisco was being flown by 1970 followed by non-stop Boeing 727-100 service from Vancouver to Los Angeles by the mid 1970s. Also during the mid 1970s, CP Air was operating stretched Douglas DC-8-63 jetliners (which the airline called the Super DC-8 "Spacemaster") on the Vancouver-Honolulu-Nandi-Sydney route twice a week. Service to New Zealand resumed in 1985 along with non-stop flights from Vancouver to Hong Kong, and in 1986 CP Air became the first North American airline with a non-stop flight between North America and Mainland China with a weekly flight to Shanghai. Flights to Beijing, Bangkok, Rio de Janeiro, and São Paulo