14 C.F.R. § 325.12
Any person, except one filing individually as a consumer, who files a document under this part, including responses to the questionnaire, shall serve that document upon those listed in § 325.4(a) of this part and upon the following:
[Docket No. 82, 50 FR 2434, Jan. 16, 1985, as amended by Doc. No. DOT-OST-2014-0140, 84 FR 15938, Apr. 16, 2019]