The European Common Aviation Area (ECAA) is a single market in aviation services.
ECAA agreements were signed on 5 May 2006 in Salzburg, Austria between the EU and some external countries. It built upon the EU's acquis communautaire and the European Economic Area. The ECAA liberalises the air transport industry by allowing any company from any ECAA member state to fly between any ECAA member states airports, thereby allowing a "foreign" airline to provide domestic flights.