49 CFR § 1546.207 - Screening of individuals and property.
(b) Locations within the United States at which TSA conducts screening. As required in its security program, each foreign air carrier must ensure that all individuals or property have been inspected by TSA before boarding or loading on its aircraft. This paragraph applies when TSA is conducting screening using TSA employees or when using companies under contract with TSA.
(c) Foreign air carrier conducting screening. Each foreign air carrier must use the measures in its security program to inspect the individual or property. This paragraph does not apply at locations identified in paragraphs (b) of this section.