Purolator adds turboprop freighters to cross-border air network Canadian express company outsources flying to Chorus Aviation as part of expansion effort 0 70 2 minutes read The De Havilland Dash 8-400 is a larger, newer version of the aircraft being used by Purolator for package delivery. (Photo: De Havilland Aircraft of Canada) A subsidiary of Chorus Aviation (TSX: CHR) last month began flying packages for Purolator Inc., Canada’s largest courier, with turboprop aircraft under a three-year contract to serve the U.S. cross-border market, the companies announced Wednesday. The expanded air capacity is designed to increase service options for express shipments and is part of a broader effort to invest in infrastructure for the delivery network.