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The intensity of cosmic radiation may be 100 times greater flying than on the ground. It increases when we fly based on factors such as: the plane's altitude, the plane's proximity to the poles of the earth, the length of the flight, and the presence of solar flares. A polar crossing saves a lot of fuel costs but increases the radiation. A flight from Chicago to Beijing over the polar cap is estimated to give you the same dose of radiation as two chest X-rays.
