1. Federal Aviation Administration, "Notice for Proposed Rule Making: Noise Certification for Supersonic Airplanes (Docket No.:FAA-2020-0316; Notice No. 20-60)," Tech. Rep. 71, FAA,2020. URLhttps://www.federalregister.gov/ documents/2020/04/13/2020-07039/noise-certification-of-supersonic-airplanes, [retrieved 6 June 2022].