Williams, George2007Williams, G 2007, 'Achieving open skies', Revista Lusófona de Ciências Aeronáuticas.Revista Lusófona de Ciências AeronáuticasTypes of Air Transport Trading Agreements: - Bilateral - "Open Skies" - Plurilateral - Multilateralapplication/pdfengopenAccessTRANSPORTES AÉREOSCOMPANHIAS AÉREASINDÚSTRIA AÉREAAIR TRANSPORTAIRLINESAIRLINE INDUSTRYAchieving open skiesarticle