open skies
noun[plural]
TRANSPORTukusasituationin whichgovernmentsof differentcountriesallowcompaniesfrom thosecountriestoofferairpassengerservicesbetween each other:
Theproposedalliancebetween the twoairlinecompaniescouldbreakthe five-yeardeadlockonopenskies.
anopenskiesaccord/agreement/deal