49 C.F.R. § 1122.7
Any person that produces documents to the Board pursuant to §1122.3 or §1122.4 may claim that some or all of the information contained in a particular document or documents is exempt from the mandatory public disclosure requirements of the Freedom of Information Act (FOIA), 5 U.S.C. 552 , is information referred to in 18 U.S.C. 1905 , or is otherwise exempt by law from public disclosure. In such case, the person making such a claim shall, at the time the person produces the document to the Board, indicate on the document that a request for confidential treatment is being made for some or all of the information in the document. In such case, the person making such a claim also shall file a brief statement specifying the specific statutory justification for non-disclosure of the information in the document for which confidential treatment is claimed. If the person states that the information comes within the exception in 5 U.S.C. 552(b)(4) for trade secrets and commercial or financial information, and the information is responsive to a subsequent FOIA request to the Board, 49 CFR 1001.4 shall apply.
49 C.F.R. § 1122.7