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"1. Definitions"(PDF). Annex 6, Operation of Aircraft Part I, International Commercial Air Transport – Aeroplanes (9 ed.). International Civil Aviation Organization (ICAO). July 2010. pp. 1, 3 and 5. ISBN9789292315368. Archived(PDF) from the original on 12 January 2015. Retrieved 17 March 2019.
web.archive.org
"1. Definitions"(PDF). Annex 6, Operation of Aircraft Part I, International Commercial Air Transport – Aeroplanes (9 ed.). International Civil Aviation Organization (ICAO). July 2010. pp. 1, 3 and 5. ISBN9789292315368. Archived(PDF) from the original on 12 January 2015. Retrieved 17 March 2019.
"ICAO web site"(PDF). Archived(PDF) from the original on 9 February 2015. Retrieved 17 June 2020.
"5"(PDF). Strategic Review of General Aviation in the UK. CAA. July 2006. pp. 52–53, paras. 5.18–5.24. Archived(PDF) from the original on 21 December 2016. Retrieved 19 December 2016.