Air ambulances are no answer since they have trouble flying in bad weather and have had several crashes in recent years.
According to older pilots, this useless statistic came into favour at the time of conversion to jet aeroplanes when the impact of flying over the weather, rather than through it, was novel.
The discovery surveys done under the RCAHMW flying programme in extreme weather conditions - they carry out the work in the heat of summer too - mean "sometimes the story of Wales gets flipped on its head, " said Dr Driver.
The other 20% are mainly due to faulty equipment and unsafe, weather-related flying conditions.
Once the trip is under way, with Russell on board and stormy weather evoking the flying house in "The Wizard of Oz, " the movie undergoes a mood transplant.
Advances in cockpit technology have all but eliminated traditional threats such as jets flying into mountains in bad weather or slamming into the ground because of sudden wind changes on approach.
We already rely on statistical models to do everything from flying our airplanes to predicting the weather.
The pilot did not refer to any problems while flying the Robinson R22 in good weather on a route from Manston Airport in Kent to Fenland Airfield, near Spalding in Lincolnshire.
The desert area is favored by the U.S. military and its allies for training because the hot, dusty conditions and mountains replicate Afghanistan's harsh environment and the clear weather allows for constant flying.
But any hopes they had for gaining a foothold in commercial aviation were dashed when the Commerce Department, under pressure from underemployed male pilots, exiled women from the field by prohibiting them from flying planes carrying passengers in bad weather.
With planes, you can reduce your risk considerably by flying a well-maintained airplane in daylight, in good weather, and by not running out of fuel.
The experienced pilot, from near Reading in Berkshire, who had amassed 12, 000 flying hours, had asked to be diverted to a nearby heliport because of bad weather.
Added recently are a high-flying zip-line and an even higher wind turbine, both of which remain open year-round (weather dependent).
They are flying out to Canada next month, and plan to set off in late June or early July, depending on weather conditions.
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