49 U.S.C. § 1152: Joinder and intervention in aviation proceedings

A person interested in or affected by a matter under consideration in a proceeding or a civil action to enforce section 1132, 1134(b) or (f)(1) (related to an aircraft accident), or 1155(a) of this title, or a regulation prescribed or order issued under any of those sections, may be joined as a party or permitted to intervene in the proceeding or civil action.