G-AVYE was a Trident 1E. We had to complete a return (a handwritten form) for each commercial departure. The CAA rang one day to say we had made a mistake as it was impossible to get 144/146 (I forget the exact number) on a Trident. Channel Airways could by taking out one set of toilets! It was the only departure I've seen kick dust up at the upwind end of the runway.