Line A.
Line A. An imaginary line within the U.S., approximately paralleling the U.S.-Canadian border, north of which Commission coordination with the Canadian authorities in the assignment of frequencies is generally required. It begins at Aberdeen, Washington, running by great circle arc to the intersection of 48 N., 120 W., then along parallel 48 N., to the intersection of 95 W., thence by great circle arc through the southernmost point of Duluth, Minnesota, thence by great circle arc to 45 N., 85 W., thence southward along meridian 85 W. to its intersection with parallel 41 N., to its intersection with meridian 82 W., thence by great circle arc through the southernmost point of Bangor, Maine, thence by great circle arc through the southernmost of Searsport, Maine, at which point it terminates.