Prinair  de Havilland D.H.114 Heron  N581PR                                 (c/n  14143)

                                        The above image is from the William W. Sierra collection and shows a Heron with the original
                                        Gipsy Queen 30 engines.  Like the rest of the fleet, it was soon converted, in the airline's work-
                                        shops, to accommodate Continental IO-520 engines having secured their own license for these
                                        mods.   This conversion greatly enhanced the take off and cruising speed of the otherwise rather
                                        indifferent Heron performance.   During the 1970s the airline expanded further to include services
                                        to Opa-Locka, Florida, Martinique and Barbados.  In these pre code-sharing days, Prinair was,
                                        in fact, the largest pure commuter passenger air carrier in the world in terms of numbers of sched-
                                        uled flights.