Daiichi Aviation, which operates as First Flying (Okinawa Naha), has received a safety improvement recommendation from Japan's Osaka Regional Civil Aviation Bureau after its DHC-6-400 JA201D (msn 915) was operated with a known weather radar defect on July 12-13, 2026. The malfunction was identified before an Okinawa Naha-Ishigaki ferry flight, but the required maintenance and pre-departure checks were not carried out, and the aircraft went on to operate an Ishigaki-Hateruma roundtrip with the defect unresolved. The regulator also issued a warning to the company's safety manager and ordered improvements to safety management, compliance training, and aircraft airworthiness checks, with corrective measures to be reported by December 1. According to ch-aviation data, the carrier operates two Twin Otters.