Piper Aircraft Co. v. Reyno is a landmark U.S. Supreme Court case from 1981 that addressed the doctrine of forum non conveniens, which allows courts to dismiss a case if another forum is significantly more convenient for the parties involved. The case involved a plane crash in Scotland, and the court held that the plaintiffs' choice of forum (Pennsylvania) was less convenient compared to Scotland, where the accident occurred and where most evidence and witnesses were located. This decision underscored the importance of convenience and justice in determining the proper venue for legal disputes.