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United Kingdom
Key definition
IP completion day definition

What does IP completion day mean? The point in time marking the end of the Brexit implementation (transition) period for UK legal purposes. In practice, it is the trigger date used in UK statutes, statutory instruments and contracts to determine when EU law stopped applying and when UK amendments took effect. It is defined in legislation: section 39 of the European Union (withdrawal agreement) Act 2020 fixes “IP completion day” as 11.00 p.m. on 31 December 2020 (UK time). Key legal effects include: establishing the snapshot for “retained EU law” under the European Union (Withdrawal) Act 2018; altering the supremacy and direct effect of EU law as...

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UK aircraft registration and deregistration: a practitioner’s guide to CAA procedures, register types, insurance, operational restrictions, and Cape Town Convention/IDERA issues

Practice notes
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To operate an aircraft across borders, the owner must register it with an aviation authority. While international conventions exist, the form of the register, the procedures for registration and deregistration, and the criteria for keeping a registration valid differ between countries, so the chosen state of registration requires careful consideration by any aircraft owner.

Why do you register aircraft and where do you do it?

In 1944, the Convention on International Civil Aviation took place in Chicago (the ‘Chicago Convention’). It led to the creation of the International Civil Aviation Organisation, a specialised United Nations agency responsible for coordinating and regulating international air travel. Under Article 20 of the Chicago Convention, to which the UK is a signatory, every aircraft engaged in international air navigation must carry appropriate nationality and registration marks. Therefore, all aircraft must be registered with an aviation authority to fly internationally. Each country sets its own rules and regulations for aircraft registration. The Chicago Convention also confirms, in Article 18, that an aircraft cannot be entered in more than one national register at the same time...

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Web page updated on 21/05/2026

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