; (2) to facilitate and vigorously defend approvals of United States aerospace products and services abroad; (3) with respect to bilateral partners, to use bilateral safety agreements and other mechanisms to improve validation of type certificated aeronautical products and services and enhance mutual acceptance in order to eliminate redundancies and unnecessary costs; and (4) with respect to the aeronautical safety authorities of a foreign country, to streamline validation and facilitate acceptance of United States aerospace standards, products, and services. . 119K. (a) In general Subchapter I of chapter 417 of title 49, United States Code, is amended by adding at the end the following: 41725 Prohibition on certain cell phone voice communications (a) Prohibition The Secretary of Transportation shall issue regulations— (1) to prohibit an individual on an aircraft from engaging in voice communications using a mobile communications device during a flight of that aircraft in scheduled passenger interstate air transportation or intrastate air transportation; and (2) that exempt from the prohibition described in paragraph (1)— (A) any member of the flight crew on duty on an aircraft