On the website of the Swiss magazine Beobachter there is a long article drawing parallels between the destruction of a Swissair aircraft en route from Zürich to Tel Aviv in 1970 and the destruction of Pan Am 103 in 1988. Apparently the Lockerbie investigators were so struck by the similarities that they spent a considerable time conferring with the Swiss. However, as we know, the focus of the Lockerbie investigation eventually switched from Palestinian terrorist groups to Libya. The Beobachter article sets out why this might have been a mistake. The article, in German, can be read here.
Wikipedia's article on the crash of Swissair Flight 330 at Würenlingen can be read here.