Let's be honest: the implementation of the United and Continental merger has been rocky for customers and employees.
The merger mania which goes on and on and on is the sign of the disappearance of competition. As we deregulate, the mergers increase, which means there's less and less competition. At the national level, at the regional level, but also at the international level.
The law does not allow the FTC to just snap its fingers and temporarily block a merger.