The IAEA Regulations for the safe transport of radioactive material specify test requirements for Type C packages, which are used for shipments of radioactive material by air. From 1998 to 2006, the IAEA conducted a coordinated research project (CRP) to assess aircraft accident frequency and severity in the context of Type C package test requirements. This publication presents the outcome of the original research conducted under the CRP. The results are expected to lead to increased knowledge of the post-crash survivability of packages containing high activity radioactive material.