Premise: The Winter Hill air disaster occurred on 27 February 1958 when the Silver City Airways Bristol 170 Freighter "G-AICS", traveling from the Isle of Man to Manchester, England, crashed into Winter Hill (also known as Rivington Moor) several hundred yards away from the Independent Television Authority's Winter Hill transmitting station.
Hypothesis: Traveling by plane from the Isle of Man to Manchester, England was dangerous in the late 1950's.