This is just paranoia... 1x carry x-ray pass per 100 ISO speed is based on what??? I've put 400 ISO through 16 passes between Asia and the US with no decernible affects; and 3200 at least 6x. The radiation doses your film receives on longer flights at altitude exceeds a pass through carry on back-scatter x-ray machines. Basically, in over 99% of cases, carry on x-ray has no practical impact on film.
Originally Posted by pbromaghin