# The Air Navigation Order 1989, Paragraph 2


The nationality and registration marks shall be displayed to the best advantage, taking into consideration the constructional features of the aircraft and shall always be kept clean and visible.

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Source: https://www.legislation.gov.uk/uksi/1989/2004/schedule/1/part/B/paragraph/2 (the official version)
Page: https://openlegislation.uk/air-navigation-order-1989/schedule-1/part-B/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.