Margaret Thatcher was a strong supporter of the single market in Europe and signed the Single European Act.

BBC: Europe and Baroness Thatcher: The great divide

And as America is the biggest single air-travel market in the world, it would be sensible for Europe to act as a single air-travel market too.

ECONOMIST: Pterodactyls across the Atlantic | The

The act also contains an EU Citizenship Report, offering suggestions on ways to make the single market more beneficial to individual citizens.

BBC: Barnier presents single market act