A 'no deal' Brexit could bring about what the airline industry, among others, is calling the "worst case scenario".
Without any agreements made, British and European Union airlines will automatically lose the right to fly to each other's territories as Britain leaves the EU without a divorce deal.
No deal could also mean some British airlines would no longer be able to fly to other non-EU countries, such as the United States and Canada. These routes are currently covered by EU-wide 'Open Skies' agreements, but this arrangement is jeopardised by Brexit.
If there is no agreement in place before the March deadline, British airlines would have to renegotiate agreements for each and every route they fly. And if a new agreement isn't reached for a route - the airlines would no longer be able to fly on it.
"We'll provide more information in the coming months, with the aim of giving aviation businesses and passengers as much certainty as possible ahead of the UK's exit from the EU," the British government said in a document sent to the industry this week.
The document also said people travelling with pets could face checks of up to four months.
Reuters / Newshub.