Williams, John2007Williams , J 2007 , ' Impact of deregulation ' , Default journal .1646-3730Revista Lusófona de Ciências Aeronáuticasapplication/pdfengopenAccessTRANSPORTES AÉREOSCOMPANHIAS AÉREASINDÚSTRIA AÉREAAIR TRANSPORTAIRLINESAIRLINE INDUSTRYImpact of deregulation