These attempts rarely had the success expected and, although some progress has been registered in recent years, the situation has not evolved significantly so that divergences in class of travel among the organizations of the common system persist.
这些尝试极少取得预期的成功，尽管近几年取得一些进展，但情况没有发生重大变化，因此共同制度各组织间旅行舱位等级方面的差异仍然存在。