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We present a systematic approach to effectively evaluate potential risk costcaused by exposure to solar proton events (SPEs) from solar flares for theairline industry. We also evaluate associated health risks from radiation, toprovide relevant alternative ways to minimize economic loss and opportunity.The estimated radiation dose induced by each SPE for the passengers of eachflight is calculated using ExoKyoto and PHITS. We determine a few scenarios forthe estimated dose limit at 1 and 20mSv, corresponding to the effective doselimit for the general public and occupational exposure, respectively, as wellas a higher dose induced an extreme superflare. We set a hypothetical airlineshutdown scenario at 1mSv for a single flight per passenger, due to legalrestrictions under the potential radiation dose. In such a scenario, wecalculate the potential loss in direct and opportunity cost under thecancelation of the flight. At the same time, we considered that, even undersuch a scenario, if the airplane flies at a slightly lower altitude (from 12 to9.5km: atmospheric depth from 234 to 365g/cm$^{2}$), the total loss becomesmuch smaller than flight cancelation, and the estimated total dose goes downfrom 1.2 to 0.45mSv, which is below the effective dose limit for the generalpublic. In case of flying at an even lower altitude (7km: atmospheric depth484g/cm$^{2}$), the estimated total dose becomes much smaller, 0.12 mSv. If weassume the increase of fuel cost is proportional to the increase in atmosphericdepth, the increase in cost becomes 1.56 and 2.07 for the case of flying at 9.5km and at 7 km, respectively. Lower altitude flights provide more safety forthe potential risk of radiation doses induced by severe SPEs. At the same time,since there is total loss caused by flight cancelation, we propose thatconsidering lower flight altitude is the best protection against solar flares.

Cost estimation for alternative aviation plans against potential radiation exposure associated with solar proton events for the airline industry