Convention between the United States of America and other governments respecting international civil aviation. Formulated at Chicago December 7, 1944; signed on the part of the United States of America December 7, 1944; ratification advised by the Senate of the United States of America July 25, 1946; ratified by the President of the United States of America August 6, 1946; ratification of the United States of America deposited at Washington August 9, 1946; proclaimed by the President of the United States of America March 17, 1947; effective April 4, 1947.