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Civil aviation (aircraft) is one of the public transportation industries that requires the highest safety standards. However, several accidents on aircraft maintenance system had revealed that there is a need to secure the record integrity and traceability. Motivated by this issue and supported by an airline, in this work, we design and implement AirChain, a blockchainbased aircraft maintenance record system, in which the data can be stored in a way that is both resistant to tampering and easy to access. The experimental results indicate the viability and practicability of our system.