(a) Every electronic tariff filed by or on behalf of an air carrier that contains fares which, by international convention or agreement entered into between any other country and the United States, are required to be filed with that country, shall include the following statement:

The rates, fares, charges, classifications, rules, regulations, practices, and services provided herein have been filed in each country in which filing is required by treaty, convention, or agreement entered into between that country and the United States, in accordance with the provisions of the applicable treaty, convention, or agreement.