The Joint Aviation Authorities (JAA) was an associated body of the ECAC representing the civil aviation regulatory authorities of a number of European States who had agreed to co-operate in developing and implementing common safety regulatory standards and procedures. It was not a regulatory body, regulation being achieved through the member authorities.
The European states agreed to co-operate and form the JAA to deal with all transportation issues.
The JAA is an associated body dealing with civil aviation , not all transportation.