"United States. Department of State." . . "Aeronautics, Commercial Law and legislation United States." . . "Great Britain." . . "Aeronautics, Commercial Law and legislation." . . "United States. Treaties, etc. Great Britain, Apr. 28, 1976." . . "Aeronautics, Commercial Law and legislation Great Britain." . . . . "United States." . . "Air charter services : understanding between the United States of America and the United Kingdom of Great Britain and Northern Ireland, effected by exchange of notes, signed at London April 28, 1976, with related letters" . . . . . . . . . .