The Montreal Convention is now twenty-one. This article summarizes its purpose, passage, and what it added to its predecessor, the Warsaw Convention, and its progeny. It considers the case law that it has produced and issues that arise in its application. It is concluded that the Montreal Convention has not passed its sell-by date and remains a praiseworthy international instrument for the regulation of air carrier liability, but suggestions are made as to possible further revisions and enhancements.