The EU must make Britain's air industry sign up to the bloc's environment rules if it wants to keep access to European skies after Brexit, a campaign group warned in a report Wednesday.

Airlines should stay in the EU's emissions trading scheme and follow rules against subsidies to prevent Britain becoming a "carbon haven", Brussels-based group Transport and Environment said in the report seen by AFP.

The group -- which has had meetings with EU Brexit negotiator Michel Barnier's task force -- warned that without a deal British planes could be unable to land in the bloc the day after the UK leaves.

"As London works out its future relationship with the EU, it should be able to keep its current level of access to Europe’s aviation market by agreeing to maintain EU rules designed to curb flying’s environmental impact," said Kristina Wittkopp, legal analyst at Transport and Environment (T&E) who wrote the report.