In an attempt to bring this thread back to something vaguely resembling a discussion of the original post, I'll summarise the situation that will exist in the event of a 'No Deal' Brexit taking effect on 29th March. Note - I'm making no judgement about the desirability or likelihood of this occurring.
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In the absence of a replacement for the Open Skies Agreement, no aircraft can land or take off to or from the UK. Not just to/from the EU, but also to other countries in the Agreement, including the USA. The planes would be uninsured, would not have approved flight plans and therefore cannot take off, fly into anyone's airspace, or land.
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Holders of British commercial pilots licenses will find these are no longer accepted internationally - British aircrew will no longer be able to fly in to or out of the UK.
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Aircraft are repaired and maintained by highly qualified and certified technical staff in certified hangers. Post-Brexit, UK certifications will no longer be internationally recognised, meaning that a plane serviced by a UK technician cannot legally fly. Planes will not fall out of the sky - they will simply not be allowed to take off.
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Airlines need to book take-off and landing slots many months in advance. Airlines are currently faced with a dilemma - do they book slots now and incur massive costs if the flights cannot fly or do they wait and risk that when there is eventually clarity, all the slots have been taken?
This affects all commercial flights, passenger as well as freight flights. The UK tourist industry would be badly affected (foreign tourists generate revenues of over $20 billion a year in the UK). The supply of fresh food and medicines to the UK would be severely disrupted.
Posters have mentioned TUI's T&Cs in regard to Brexit. I'll add this quote from Inghams;
At present, the Changes in Law [following Brexit] that we consider are most likely to occur and, in turn, affect your chosen arrangements are as follows:
a) A potential inability for the United Kingdom as a whole (and ourselves, for the purpose of this clause and your chosen arrangements) to rely on the free movement of workers and, in particular, the Posted Workers Directive. The result of this may be that we are unable to provide you with certain services that make up your chosen arrangements, such as the provision of a local representative, chalet staff, etc.
b) A potential inability for British airlines to operate flights into / out of the European Union and, conversely, an inability for European airlines to operate into / out of the United Kingdom. The result of this may be that we are unable to provide you either with the flights that you have booked or indeed any replacement flights
To those who believe that they can just drive to the Continent instead, there will be other hurdles to overcome.
Ferry capacity will be greatly reduced as boarding and unloading times are increased. It may be necessary to limit or prioritise traffic to certain goods only, such as food supplies, with limited or no provision for private vehicles.
In the event of 'No Deal', UK drivers licenses will no longer be valid on their own - drivers will need to acquire an International Drivers Permit. UK drivers are currently automatically covered by third party insurance when driving in the EU. This ceases on 29th March, meaning drivers will need additional insurance.
UK Coach and freight drivers risk being unable to drive in the EU post-Brexit unless they have a EU licence or permit. There is currently no system in place for UK drivers to acquire this (as it is not currently a requirement).