Abstract: The European Radiation Dosimetry Group, EURADOS focuses, among other issues, on the harmonization of dose assessment within Europe and conformance with international practices. Along these lines, this EURADOS report compares route doses and dose rates at flight altitudes due to solar cosmic radiation (SCR) associated with ground level enhancements (GLEs) as calculated by means of nine available computer codes. Some of these codes are routinely used for the assessment of radiation exposure of aircraft...