1. Routes to United States authorized to foreign air carriers of Western Hemisphere countries under permit: December 31, 1968 Princeton University Public content 1968. United States. Civil Aeronautics Board. Office of the Secretary. North Decimal Degree 64.8377778. South Decimal Degree -56.0167. East Decimal Degre... [Washington, D.C.] : [s.n.], 1968.