Canadian Pacific turned to the trusty Douglas DC-6B to carry it through the 1950s, but even though the type was replaced by new turboprops, and then jets, on the long haul routes it was reliable and economic enough to be repurposed. The Sixes provided an upgrade to passengers on the domestic routes and continued to serve CP into the late 1960s, a testament to the type's rugged excellence.
True North Pacific service was begun on March 10 and CF-CUO, now named 'City of Lima', operated the new Vancouver-Mexico City-Lima route on October 24. All four DC-6Bs were delivered by late June 1953 and registered CF-CUO-R.
Two freighter DC-6As were delivered in September 1953 in anticipation of the airline being granted a cargo service between Vancouver, Edmonton, The Pas, Toronto and Montreal. Unfortunately in the face of TCA protests the route was not awarded and both were sold on and had left the fleet by June 1954. TCA took on the route with Bristol freighters but it proved highly uneconomic, which must have provided much schadenfreude for Canadian Pacific.
1987. Bain, D,M. Canadian Pacific Air Lines: Its History and Aircraft. Cal/Oka Printing Ltd
CF-CUP DC-6 Crash. Aviation Safety Network