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.

( Pub. L. 103–272, § 1(d) , July 5, 1994 , 108 Stat. 756 .)