Already operating 737-200s, and with the recently acquired Eastern Provincial also operating the type, CP Air took the retrograde step of deciding to standardise on the series 200. This resulted in the three delivered series 300s being sold to Guiness Peat Aviation (GPA) and swapped for more 737-200s. C-FCPJ became PP-SNS with VASP and in 1993 N686SW with Southwest. She was retired on 27th November 2012. CP Air was unable to cancel its remaining two 737-300 orders and they were also delivered, though both wore the new Canadian Pacific/Pacifique scheme for their brief six month services before they too were traded to GPA.
Canadian battled it out with Air Canada until 2001 but that's another story!