For further information regarding the Fly America Act, please view the full code of federal regulations at 41 CFR 301-10.131 through 301-10.143.
Code-sharing agreements with foreign air carrier comply with the Fly America Act Regulations. The ticket, or documentation for an electronic ticket, must identify the U.S. carrier's designator code and flight number generally stated as “U.S. Air Carrier flight XXXX operated by Foreign Air Carrier.”
For example, the following would be Allowable: American Airlines (AA) 6143 New York to London operated by British Airways