There's also extra radiation exposure due to less atmospheric shielding (and there's no minimal safe levels for ionizing, anything extra increases your cancer r

There's also extra radiation exposure due to less atmospheric shielding (and there's no minimal safe levels for ionizing, anything extra increases your cancer risk), so it probably won't work out to a positive outcome. Oh, and risk of catching an infection in the plane or airport is higher than in your own car - and that outweighs both crash and radiation risks..