1. FAA, “The Annual Compendium of Commercial Space Transportation 2018”, https://www.faa.gov/about/office_org/headquarters_offices/ast/media/2018_AST_Compendium.pdf.
2. FAA, “Fact Sheet – David J. Hurley Air Traffic Control System Command Center “, https://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=23314.
3. The FAA's Air Traffic Organization does not currently use RHAs, and does not intend to do so until it completes a Safety Risk Management panel on that capability. Once the panel completes successfully, it is expected that RHAs will be used as described in this paper.
4. FAA, “Traffic Flow Management System”, https://aspmhelp.faa.gov/index.php/Traffic_Flow_Management_System_(TFMS).
5. FAA, “Fact Sheet – En Route Automation Modernization”, https://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=7714.