A Trijet is an aircraft powered by three jet engines. Early twin-jet designs were limited by the FAA’s “60-minute rule”, whereby the flight path of twin-engined jetliners was restricted to within 60 minutes’ flying time from a suitable airport, in case of engine failure. In 1964 this rule was lifted for trijet designs, as they had a greater safety margin. This led to a flurry of trijet designs, which by 1980 had become the most popular airliner configuration.

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