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 Lycoming IO-540 engines using a kit supplied by Riley Aircraft Corp
                                       .of  Fort Lauderdale, Florida.   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 scheduled flights.