Федеральное управление гражданской авиации США
https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap5_section_4.html Federal aviation Administration. FAA. Aeronautical Information Manual. Effective: January 30, 2020, Change: 1. FAA National Headquarters (FOB−10B) Procedures Support (AJV−81). Department of Transportation. Federal Aviation Administration