Williams, George2007Williams , G 2007 , ' Cost comparison of network, low-cost and charter airlines ' , Default journal .1646-3730Revista Lusófona de Ciências Aeronáuticasapplication/pdfengopenAccessTRANSPORTES AÉREOSCOMPANHIAS AÉREASINDÚSTRIA AÉREAVOOS CHARTERTARIFAS LOW COSTAIR TRANSPORTAIRLINE INDUSTRYCHARTER FLIGHTSLOW COST FARECost comparison of network, low-cost and charter airlines